diff --git a/api-test/backend/src/main/java/io/metersphere/api/dto/ErrorReportLibraryParseDTO.java b/api-test/backend/src/main/java/io/metersphere/api/dto/ErrorReportLibraryParseDTO.java
index e880e561dd..b3ea038fd0 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/dto/ErrorReportLibraryParseDTO.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/dto/ErrorReportLibraryParseDTO.java
@@ -25,7 +25,7 @@ public class ErrorReportLibraryParseDTO {
             String errorCodeStr = StringUtils.join(this.errorCodeList,";");
             return errorCodeStr;
         }else {
-            return "";
+            return StringUtils.EMPTY;
         }
 
     }
diff --git a/api-test/backend/src/main/java/io/metersphere/api/dto/JmxInfoDTO.java b/api-test/backend/src/main/java/io/metersphere/api/dto/JmxInfoDTO.java
index 07b58aaefc..e68f6e86ab 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/dto/JmxInfoDTO.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/dto/JmxInfoDTO.java
@@ -26,13 +26,13 @@ public class JmxInfoDTO {
     private List<FileMetadata> fileMetadataList;
 
     public JmxInfoDTO(String name, String xml, Map<String, String> attachFiles) {
-        this.name = StringUtils.replace(name, "/", "");
+        this.name = StringUtils.replace(name, "/", StringUtils.EMPTY);
         this.xml = xml;
         this.attachFiles = attachFiles;
     }
 
     public void setName(String name) {
-        this.name = StringUtils.replace(name, "/", "");
+        this.name = StringUtils.replace(name, "/", StringUtils.EMPTY);
     }
 
     public void addFileMetadataLists(List<FileMetadata> list) {
diff --git a/api-test/backend/src/main/java/io/metersphere/api/jmeter/TestResult.java b/api-test/backend/src/main/java/io/metersphere/api/jmeter/TestResult.java
index df4897c3d9..878074434f 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/jmeter/TestResult.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/jmeter/TestResult.java
@@ -131,7 +131,7 @@ public class TestResult {
             result.setRequestResults(formatedResult);
 
             result.getRequestResults().forEach(item -> {
-                String itemAndScenarioName = "";
+                String itemAndScenarioName = StringUtils.EMPTY;
                 if (StringUtils.isNotEmpty(item.getScenario())) {
                     //第1个：当前场景， 第all_id_names个：最后一层场景
                     List<String> all_id_names = JSON.parseObject(item.getScenario(), List.class);
diff --git a/api-test/backend/src/main/java/io/metersphere/api/parse/ApiImportAbstractParser.java b/api-test/backend/src/main/java/io/metersphere/api/parse/ApiImportAbstractParser.java
index e3ba82d0ee..a3d1dfa170 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/parse/ApiImportAbstractParser.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/parse/ApiImportAbstractParser.java
@@ -57,7 +57,7 @@ public abstract class ApiImportAbstractParser<T> implements ApiImportParser<T> {
     }
 
     protected String getBodyType(String contentType) {
-        String bodyType = "";
+        String bodyType = StringUtils.EMPTY;
         if (StringUtils.isBlank(contentType)) {
             return bodyType;
         }
@@ -85,7 +85,7 @@ public abstract class ApiImportAbstractParser<T> implements ApiImportParser<T> {
     }
 
     protected void addBodyHeader(MsHTTPSamplerProxy request) {
-        String contentType = "";
+        String contentType = StringUtils.EMPTY;
         if (request.getBody() != null && StringUtils.isNotBlank(request.getBody().getType())) {
             switch (request.getBody().getType()) {
                 case Body.WWW_FROM:
@@ -176,7 +176,7 @@ public abstract class ApiImportAbstractParser<T> implements ApiImportParser<T> {
     }
 
     protected void addCookie(List<KeyValue> headers, String key, String value) {
-        addCookie(headers, key, value, "", true);
+        addCookie(headers, key, value, StringUtils.EMPTY, true);
     }
 
     protected void addCookie(List<KeyValue> headers, String key, String value, String description, boolean required) {
@@ -184,17 +184,17 @@ public abstract class ApiImportAbstractParser<T> implements ApiImportParser<T> {
         for (KeyValue header : headers) {
             if (StringUtils.equalsIgnoreCase("Cookie", header.getName())) {
                 hasCookie = true;
-                String cookies = Optional.ofNullable(header.getValue()).orElse("");
+                String cookies = Optional.ofNullable(header.getValue()).orElse(StringUtils.EMPTY);
                 header.setValue(cookies + key + "=" + value + ";");
             }
         }
         if (!hasCookie) {
-            addHeader(headers, "Cookie", key + "=" + value + ";", description, "", required);
+            addHeader(headers, "Cookie", key + "=" + value + ";", description, StringUtils.EMPTY, required);
         }
     }
 
     protected void addHeader(List<KeyValue> headers, String key, String value) {
-        addHeader(headers, key, value, "", "", true);
+        addHeader(headers, key, value, "", StringUtils.EMPTY, true);
     }
 
     protected void addHeader(List<KeyValue> headers, String key, String value, String description, String contentType, boolean required) {
diff --git a/api-test/backend/src/main/java/io/metersphere/api/parse/HarScenarioAbstractParser.java b/api-test/backend/src/main/java/io/metersphere/api/parse/HarScenarioAbstractParser.java
index 795ae505ab..5d191b4631 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/parse/HarScenarioAbstractParser.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/parse/HarScenarioAbstractParser.java
@@ -147,7 +147,7 @@ public abstract class HarScenarioAbstractParser<T> extends ApiImportAbstractPars
     }
 
     private void parseHeaderParameters(HarHeader harHeader, List<KeyValue> headers) {
-        addHeader(headers, harHeader.name, harHeader.value, harHeader.comment, "", false);
+        addHeader(headers, harHeader.name, harHeader.value, harHeader.comment, StringUtils.EMPTY, false);
     }
 
     private void addPreScript(MsHTTPSamplerProxy request, List<PostmanEvent> event) {
@@ -227,7 +227,7 @@ public abstract class HarScenarioAbstractParser<T> extends ApiImportAbstractPars
         if (options != null) {
             JsonNode raw = options.get(PostmanRequestBodyMode.RAW.value());
             if (raw != null) {
-                String bodyType = "";
+                String bodyType = StringUtils.EMPTY;
                 switch (raw.get("language").textValue()) {
                     case "json":
                         bodyType = Body.JSON_STR;
@@ -244,7 +244,7 @@ public abstract class HarScenarioAbstractParser<T> extends ApiImportAbstractPars
     }
 
     private String getDefaultStringValue(String val) {
-        return StringUtils.isBlank(val) ? "" : val;
+        return StringUtils.isBlank(val) ? StringUtils.EMPTY : val;
     }
 
     private String getBoundaryFromContentType(String contentType) {
diff --git a/api-test/backend/src/main/java/io/metersphere/api/parse/JmeterDocumentParser.java b/api-test/backend/src/main/java/io/metersphere/api/parse/JmeterDocumentParser.java
index 7e0efbc356..93872f1ba8 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/parse/JmeterDocumentParser.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/parse/JmeterDocumentParser.java
@@ -159,7 +159,7 @@ public class JmeterDocumentParser {
                     u += k + "=" + ScriptEngineUtils.buildFunctionCallString(v);
                     return u;
                 });
-                ele.setTextContent(url + ((params != null && !"?".equals(params)) ? params : ""));
+                ele.setTextContent(url + ((params != null && !"?".equals(params)) ? params : StringUtils.EMPTY));
                 break;
             case "Argument.value":
                 String textContent = ele.getTextContent();
@@ -214,7 +214,7 @@ public class JmeterDocumentParser {
             if (p.contains("=")) {
                 String[] param = p.split("=");
                 if (param.length == 1) {
-                    strUrlParas.put(param[0], "");
+                    strUrlParas.put(param[0], StringUtils.EMPTY);
                 } else {
 
                     String key = param[0];
diff --git a/api-test/backend/src/main/java/io/metersphere/api/parse/PostmanAbstractParserParser.java b/api-test/backend/src/main/java/io/metersphere/api/parse/PostmanAbstractParserParser.java
index a8f08df623..0db1f87ee0 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/parse/PostmanAbstractParserParser.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/parse/PostmanAbstractParserParser.java
@@ -32,8 +32,8 @@ public abstract class PostmanAbstractParserParser<T> extends ApiImportAbstractPa
         }
         requestDesc.getAuth(); // todo 认证方式等待优化
         PostmanUrl url = requestDesc.getUrl();
-        MsHTTPSamplerProxy request = buildRequest(requestItem.getName(), url == null ? "" : url.getRaw(), requestDesc.getMethod(),
-                requestDesc.getBody().get("jsonSchema") == null ? "" : requestDesc.getBody().get("jsonSchema").textValue());
+        MsHTTPSamplerProxy request = buildRequest(requestItem.getName(), url == null ? StringUtils.EMPTY : url.getRaw(), requestDesc.getMethod(),
+                requestDesc.getBody().get("jsonSchema") == null ? StringUtils.EMPTY : requestDesc.getBody().get("jsonSchema").textValue());
         request.setRest(parseKeyValue(requestDesc.getUrl().getVariable()));
         if (StringUtils.isNotBlank(request.getPath())) {
             String path = request.getPath().split("\\?")[0];
@@ -168,7 +168,7 @@ public abstract class PostmanAbstractParserParser<T> extends ApiImportAbstractPa
         if (options != null) {
             JsonNode raw = options.get(PostmanRequestBodyMode.RAW.value());
             if (raw != null) {
-                String bodyType = "";
+                String bodyType = StringUtils.EMPTY;
                 switch (raw.get("language").textValue()) {
                     case "json":
                         bodyType = Body.JSON_STR;
diff --git a/api-test/backend/src/main/java/io/metersphere/api/tcp/TCPPool.java b/api-test/backend/src/main/java/io/metersphere/api/tcp/TCPPool.java
index feeaa4f4ef..ce80a1ca9e 100644
--- a/api-test/backend/src/main/java/io/metersphere/api/tcp/TCPPool.java
+++ b/api-test/backend/src/main/java/io/metersphere/api/tcp/TCPPool.java
@@ -3,6 +3,7 @@ package io.metersphere.api.tcp;
 import io.metersphere.api.tcp.server.TCPServer;
 import io.metersphere.commons.exception.MSException;
 import io.metersphere.commons.utils.LogUtil;
+import org.apache.commons.lang3.StringUtils;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -18,7 +19,7 @@ public class TCPPool {
     private TCPPool(){}
 
     public static String createTcp(int port){
-        String returnString = "";
+        String returnString = StringUtils.EMPTY;
         if(port > 0){
             TCPServer tcpServer = null;
             if(serverSockedMap.containsKey(port)){
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/ApiTestDefinitionDiffUtilImpl.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/ApiTestDefinitionDiffUtilImpl.java
index f7cf415a33..d7ccf1b344 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/ApiTestDefinitionDiffUtilImpl.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/ApiTestDefinitionDiffUtilImpl.java
@@ -207,7 +207,7 @@ public class ApiTestDefinitionDiffUtilImpl implements ApiDefinitionDiffUtil {
                     authColumns.forEach(item -> {
                         Object value = item.getOriginalValue();
                         item.setNewValue(value);
-                        item.setOriginalValue("");
+                        item.setOriginalValue(StringUtils.EMPTY);
                     });
                     diffMap.put("body_auth", JSON.toJSONString(authColumns));
                 }
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/FixedCapacityUtil.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/FixedCapacityUtil.java
index 53f2a4bde1..470cbc2e27 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/FixedCapacityUtil.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/FixedCapacityUtil.java
@@ -1,5 +1,7 @@
 package io.metersphere.commons.utils;
 
+import org.apache.commons.lang3.StringUtils;
+
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
@@ -50,7 +52,7 @@ public class FixedCapacityUtil {
 
             return logMessage;
         } catch (Exception e) {
-            return "";
+            return StringUtils.EMPTY;
         } finally {
             if (isClear && FixedCapacityUtil.jmeterLogTask.containsKey(reportId)) {
                 FixedCapacityUtil.jmeterLogTask.remove(reportId);
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/HashTreeUtil.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/HashTreeUtil.java
index bd6c3e7528..d65656335b 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/HashTreeUtil.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/HashTreeUtil.java
@@ -69,7 +69,7 @@ public class HashTreeUtil {
                             for (String param : params) {
                                 String value = envHeadMap.get(param);
                                 if (value == null) {
-                                    value = "";
+                                    value = StringUtils.EMPTY;
                                 }
                                 if (returnMap.containsKey(envId)) {
                                     returnMap.get(envId).put(param, value);
@@ -94,7 +94,7 @@ public class HashTreeUtil {
             for (Object hashTreeKey : hashTree.keySet()) {
                 HashTree itemTree = hashTree.get(hashTreeKey);
 
-                String scriptValue = "";
+                String scriptValue = StringUtils.EMPTY;
                 try {
                     if (hashTreeKey instanceof JSR223PostProcessor) {
                         JSR223PostProcessor postProcessor = (JSR223PostProcessor) hashTreeKey;
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONSchemaToDocumentUtil.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONSchemaToDocumentUtil.java
index 71a1a99fd7..58c0aaf023 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONSchemaToDocumentUtil.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONSchemaToDocumentUtil.java
@@ -78,7 +78,7 @@ public class JSONSchemaToDocumentUtil {
             Object value = null;
             boolean required = requiredList.contains(propertyName);
             if (object.has(PropertyConstant.DEFAULT)) {
-                value = object.get(PropertyConstant.DEFAULT) != null ? object.get(PropertyConstant.DEFAULT).getAsString() : "";
+                value = object.get(PropertyConstant.DEFAULT) != null ? object.get(PropertyConstant.DEFAULT).getAsString() : StringUtils.EMPTY;
                 concept.add(new DocumentElement(propertyName, propertyObjType, value, required, null));
             } else if (object.has(PropertyConstant.ENUM)) {
                 try {
@@ -102,7 +102,7 @@ public class JSONSchemaToDocumentUtil {
             } else if (propertyObjType.equals(PropertyConstant.STRING)) {
                 // 先设置空值
                 if (object.has(PropertyConstant.DEFAULT)) {
-                    value = object.get(PropertyConstant.DEFAULT) != null ? object.get(PropertyConstant.DEFAULT).getAsString() : "";
+                    value = object.get(PropertyConstant.DEFAULT) != null ? object.get(PropertyConstant.DEFAULT).getAsString() : StringUtils.EMPTY;
                 }
                 if (object.has(PropertyConstant.MOCK) && object.get(PropertyConstant.MOCK).getAsJsonObject() != null
                         && StringUtils.isNotEmpty(object.get(PropertyConstant.MOCK).getAsJsonObject().get(PropertyConstant.MOCK).getAsString())) {
@@ -149,12 +149,12 @@ public class JSONSchemaToDocumentUtil {
                 concept.add(new DocumentElement(propertyName, propertyObjType, value, required, null));
             } else if (propertyObjType.equals(PropertyConstant.ARRAY)) {
                 List<DocumentElement> elements = new LinkedList<>();
-                concept.add(new DocumentElement(propertyName, propertyObjType, "", requiredList.contains(propertyName), true, elements));
+                concept.add(new DocumentElement(propertyName, propertyObjType, StringUtils.EMPTY, requiredList.contains(propertyName), true, elements));
                 JsonArray jsonArray = object.get(PropertyConstant.ITEMS).getAsJsonArray();
                 analyzeArray(propertyName, jsonArray, elements, requiredList);
             } else if (propertyObjType.equals(PropertyConstant.OBJECT)) {
                 List<DocumentElement> list = new LinkedList<>();
-                concept.add(new DocumentElement(propertyName, propertyObjType, "", list));
+                concept.add(new DocumentElement(propertyName, propertyObjType, StringUtils.EMPTY, list));
                 analyzeObject(object, list);
             }
         }
@@ -166,7 +166,7 @@ public class JSONSchemaToDocumentUtil {
             if (obj.isJsonArray()) {
                 JsonArray itemsObject = obj.getAsJsonArray();
                 List<DocumentElement> elements = new LinkedList<>();
-                array.add(new DocumentElement(propertyName, "", "", requiredList.contains("" + i + ""), elements));
+                array.add(new DocumentElement(propertyName, StringUtils.EMPTY, StringUtils.EMPTY, requiredList.contains("" + i + ""), elements));
                 analyzeArray("", itemsObject, elements, requiredList);
             } else if (obj.isJsonObject()) {
                 List<String> requiredItems = new ArrayList<>();
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONToDocumentUtil.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONToDocumentUtil.java
index 0ccbce6004..f4479a0ccd 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONToDocumentUtil.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/JSONToDocumentUtil.java
@@ -20,11 +20,11 @@ public class JSONToDocumentUtil {
             Object value = array.get(i);
             if (value instanceof JSONObject) {
                 List<DocumentElement> childrenElements = new LinkedList<>();
-                children.add(new DocumentElement("", PropertyConstant.OBJECT, "", childrenElements));
+                children.add(new DocumentElement(StringUtils.EMPTY, PropertyConstant.OBJECT, StringUtils.EMPTY, childrenElements));
                 jsonDataFormatting((JSONObject) value, childrenElements);
             } else if (value instanceof JSONArray) {
                 List<DocumentElement> childrenElements = new LinkedList<>();
-                DocumentElement documentElement = new DocumentElement("", PropertyConstant.ARRAY, "", childrenElements);
+                DocumentElement documentElement = new DocumentElement(StringUtils.EMPTY, PropertyConstant.ARRAY, StringUtils.EMPTY, childrenElements);
                 documentElement.setArrayVerification(true);
                 children.add(documentElement);
                 jsonDataFormatting((JSONArray) value, childrenElements);
@@ -33,7 +33,7 @@ public class JSONToDocumentUtil {
                 if (value != null) {
                     type = DocumentUtils.getType(value);
                 }
-                children.add(new DocumentElement("", type, value, null));
+                children.add(new DocumentElement(StringUtils.EMPTY, type, value, null));
             }
         }
     }
@@ -43,11 +43,11 @@ public class JSONToDocumentUtil {
             Object value = object.get(key);
             if (value instanceof JSONObject) {
                 List<DocumentElement> childrenElements = new LinkedList<>();
-                children.add(new DocumentElement(key, PropertyConstant.OBJECT, "", childrenElements));
+                children.add(new DocumentElement(key, PropertyConstant.OBJECT, StringUtils.EMPTY, childrenElements));
                 jsonDataFormatting((JSONObject) value, childrenElements);
             } else if (value instanceof JSONArray) {
                 List<DocumentElement> childrenElements = new LinkedList<>();
-                DocumentElement documentElement = new DocumentElement(key, PropertyConstant.ARRAY, "", childrenElements);
+                DocumentElement documentElement = new DocumentElement(key, PropertyConstant.ARRAY, StringUtils.EMPTY, childrenElements);
                 documentElement.setArrayVerification(true);
                 children.add(documentElement);
                 jsonDataFormatting((JSONArray) value, childrenElements);
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/JmeterDocumentParser.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/JmeterDocumentParser.java
index d84e6c4d8f..59e0487ff0 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/JmeterDocumentParser.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/JmeterDocumentParser.java
@@ -339,7 +339,7 @@ public class JmeterDocumentParser implements EngineSourceParser {
                 collectionProp.addAttribute("name", "Asserion.test_strings");
                 //
 
-                appendStringProp(item, "Assertion.custom_message", "");
+                appendStringProp(item, "Assertion.custom_message", StringUtils.EMPTY);
                 appendStringProp(item, "Assertion.test_field", "Assertion.response_code");
                 appendBoolProp(item, "Assertion.assume_success", true);
                 appendIntProp(item, "Assertion.test_type", 40);
@@ -368,7 +368,7 @@ public class JmeterDocumentParser implements EngineSourceParser {
         Element collectionProp = responseAssertion.addElement(COLLECTION_PROP);
         collectionProp.addAttribute("name", "Asserion.test_strings");
         //
-        appendStringProp(responseAssertion, "Assertion.custom_message", "");
+        appendStringProp(responseAssertion, "Assertion.custom_message", StringUtils.EMPTY);
         appendStringProp(responseAssertion, "Assertion.test_field", "Assertion.response_code");
         appendBoolProp(responseAssertion, "Assertion.assume_success", true);
         appendIntProp(responseAssertion, "Assertion.test_type", 40);
@@ -462,14 +462,14 @@ public class JmeterDocumentParser implements EngineSourceParser {
         collectionProp.addAttribute("name", "Arguments.arguments");
 
 
-        appendStringProp(element, "HTTPSampler.domain", "");
-        appendStringProp(element, "HTTPSampler.port", "");
-        appendStringProp(element, "HTTPSampler.protocol", "");
-        appendStringProp(element, "HTTPSampler.contentEncoding", "");
-        appendStringProp(element, "HTTPSampler.path", "");
+        appendStringProp(element, "HTTPSampler.domain", StringUtils.EMPTY);
+        appendStringProp(element, "HTTPSampler.port", StringUtils.EMPTY);
+        appendStringProp(element, "HTTPSampler.protocol", StringUtils.EMPTY);
+        appendStringProp(element, "HTTPSampler.contentEncoding", StringUtils.EMPTY);
+        appendStringProp(element, "HTTPSampler.path", StringUtils.EMPTY);
         appendStringProp(element, "HTTPSampler.concurrentPool", "6");
         appendStringProp(element, "HTTPSampler.connect_timeout", "60000");
-        appendStringProp(element, "HTTPSampler.response_timeout", "");
+        appendStringProp(element, "HTTPSampler.response_timeout", StringUtils.EMPTY);
 
         // 空的 hashTree
         hashTree.addElement(HASH_TREE_ELEMENT);
@@ -878,7 +878,7 @@ public class JmeterDocumentParser implements EngineSourceParser {
         appendStringProp(threadGroup, "RampUp", rampUp);
         appendStringProp(threadGroup, "Steps", step);
         appendStringProp(threadGroup, "Hold", hold);
-        appendStringProp(threadGroup, "LogFilename", "");
+        appendStringProp(threadGroup, "LogFilename", StringUtils.EMPTY);
         // bzm - Concurrency Thread Group "Thread Iterations Limit:" 设置为空
 //        threadGroup.appendChild(createStringProp(document, "Iterations", "1"));
         appendStringProp(threadGroup, "Unit", "S");
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/ResultConversionUtil.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/ResultConversionUtil.java
index 5f4666bc81..e7c033f7ea 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/ResultConversionUtil.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/ResultConversionUtil.java
@@ -37,8 +37,8 @@ public class ResultConversionUtil {
         String resourceId = result.getResourceId();
 
         ApiScenarioReportResultWithBLOBs report = newScenarioReportResult(reportId, resourceId);
-        report.setTotalAssertions(Long.parseLong(result.getTotalAssertions() + ""));
-        report.setPassAssertions(Long.parseLong(result.getPassAssertions() + ""));
+        report.setTotalAssertions(Long.parseLong(result.getTotalAssertions() + StringUtils.EMPTY));
+        report.setPassAssertions(Long.parseLong(result.getPassAssertions() + StringUtils.EMPTY));
         String status = result.getError() == 0 ? ApiReportStatus.SUCCESS.name() : ApiReportStatus.ERROR.name();
         if (CollectionUtils.isNotEmpty(errorCodeDTO.getErrorCodeList())) {
             report.setErrorCode(errorCodeDTO.getErrorCodeStr());
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/WebSocketUtil.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/WebSocketUtil.java
index 0c0142c481..1b0f8a49c9 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/WebSocketUtil.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/WebSocketUtil.java
@@ -2,6 +2,7 @@ package io.metersphere.commons.utils;
 
 import io.metersphere.api.dto.MsgDTO;
 import io.metersphere.utils.LoggerUtil;
+import org.apache.commons.lang3.StringUtils;
 
 import javax.websocket.RemoteEndpoint;
 import javax.websocket.Session;
@@ -28,8 +29,8 @@ public class WebSocketUtil {
 
     // 单用户推送
     public static void sendMessageSingle(MsgDTO dto) {
-        sendMessage(ONLINE_USER_SESSIONS.get(Optional.ofNullable(dto.getReportId()).orElse("")), dto.getContent());
-        sendMessage(ONLINE_USER_SESSIONS.get(Optional.ofNullable(dto.getToReport()).orElse("")), dto.getContent());
+        sendMessage(ONLINE_USER_SESSIONS.get(Optional.ofNullable(dto.getReportId()).orElse(StringUtils.EMPTY)), dto.getContent());
+        sendMessage(ONLINE_USER_SESSIONS.get(Optional.ofNullable(dto.getToReport()).orElse(StringUtils.EMPTY)), dto.getContent());
     }
 
     // 全用户推送
diff --git a/api-test/backend/src/main/java/io/metersphere/commons/utils/XMLUtil.java b/api-test/backend/src/main/java/io/metersphere/commons/utils/XMLUtil.java
index babd98419c..7fbee97ade 100644
--- a/api-test/backend/src/main/java/io/metersphere/commons/utils/XMLUtil.java
+++ b/api-test/backend/src/main/java/io/metersphere/commons/utils/XMLUtil.java
@@ -67,7 +67,7 @@ public class XMLUtil {
         StringBuffer buffer = new StringBuffer();
         buffer.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
         try {
-            jsonToXmlStr(jObj, buffer, new StringBuffer(""));
+            jsonToXmlStr(jObj, buffer, new StringBuffer(StringUtils.EMPTY));
         } catch (Exception e) {
             LogUtil.error(e.getMessage(), e);
         }
diff --git a/api-test/backend/src/main/java/io/metersphere/service/ext/ExtApiScheduleService.java b/api-test/backend/src/main/java/io/metersphere/service/ext/ExtApiScheduleService.java
index b2dd702d99..e95d73cbd8 100644
--- a/api-test/backend/src/main/java/io/metersphere/service/ext/ExtApiScheduleService.java
+++ b/api-test/backend/src/main/java/io/metersphere/service/ext/ExtApiScheduleService.java
@@ -339,7 +339,7 @@ public class ExtApiScheduleService {
         if (list.size() > 0) {
             return list.get(0).getKey();
         } else {
-            return "";
+            return StringUtils.EMPTY;
         }
 
     }
diff --git a/api-test/backend/src/main/java/io/metersphere/service/ext/ExtProjectApplicationService.java b/api-test/backend/src/main/java/io/metersphere/service/ext/ExtProjectApplicationService.java
index fa362d8955..41f4dea435 100644
--- a/api-test/backend/src/main/java/io/metersphere/service/ext/ExtProjectApplicationService.java
+++ b/api-test/backend/src/main/java/io/metersphere/service/ext/ExtProjectApplicationService.java
@@ -128,7 +128,7 @@ public class ExtProjectApplicationService {
     public void checkProjectTcpPort(AddProjectRequest project) {
         //判断端口是否重复
         if (project.getMockTcpPort() != null && project.getMockTcpPort().intValue() != 0) {
-            String projectId = StringUtils.isEmpty(project.getId()) ? "" : project.getId();
+            String projectId = StringUtils.isEmpty(project.getId()) ? StringUtils.EMPTY : project.getId();
             ProjectApplicationExample example = new ProjectApplicationExample();
             example.createCriteria().andTypeEqualTo(ProjectApplicationType.MOCK_TCP_PORT.name()).andTypeValueEqualTo(String.valueOf(project.getMockTcpPort())).andProjectIdNotEqualTo(projectId);
             if (projectApplicationMapper.countByExample(example) > 0) {
diff --git a/performance-test/backend/src/main/java/io/metersphere/service/PerformanceTestService.java b/performance-test/backend/src/main/java/io/metersphere/service/PerformanceTestService.java
index 14045a6c59..9bf0b00a21 100644
--- a/performance-test/backend/src/main/java/io/metersphere/service/PerformanceTestService.java
+++ b/performance-test/backend/src/main/java/io/metersphere/service/PerformanceTestService.java
@@ -1001,7 +1001,7 @@ public class PerformanceTestService {
         LoadTestFileExample example1 = new LoadTestFileExample();
         example1.createCriteria().andFileIdEqualTo(fileId);
         List<LoadTestFile> loadTestFiles = loadTestFileMapper.selectByExample(example1);
-        String errorMessage = "";
+        String errorMessage = StringUtils.EMPTY;
         if (loadTestFiles.size() > 0) {
             List<String> testIds = loadTestFiles.stream().map(LoadTestFile::getTestId).distinct().collect(Collectors.toList());
             LoadTestExample example = new LoadTestExample();
diff --git a/test-track/backend/src/main/java/io/metersphere/service/TestCaseService.java b/test-track/backend/src/main/java/io/metersphere/service/TestCaseService.java
index 2f2d27488e..048ecaafcd 100644
--- a/test-track/backend/src/main/java/io/metersphere/service/TestCaseService.java
+++ b/test-track/backend/src/main/java/io/metersphere/service/TestCaseService.java
@@ -2688,7 +2688,7 @@ public class TestCaseService {
             fileContentExample.createCriteria().andFileIdIn(fileIds);
             List<FileContent> allCaseFileContents = fileContentMapper.selectByExample(fileContentExample);
             entry.getValue().stream().forEach(relation -> {
-                String filename = "";
+                String filename = StringUtils.EMPTY;
                 List<FileMetadata> fileMetadatas = allCaseFileMetadatas.stream().filter(fileMetadata -> fileMetadata.getId().equals(relation.getAttachmentId()))
                         .collect(Collectors.toList());
                 List<FileContent> fileContents = allCaseFileContents.stream().filter(fileContent -> fileContent.getFileId().equals(relation.getAttachmentId()))
@@ -2699,7 +2699,7 @@ public class TestCaseService {
                     FileAttachmentMetadata fileAttachmentMetadata = new FileAttachmentMetadata();
                     BeanUtils.copyBean(fileAttachmentMetadata, fileMetadata);
                     fileAttachmentMetadata.setId(UUID.randomUUID().toString());
-                    fileAttachmentMetadata.setCreator("");
+                    fileAttachmentMetadata.setCreator(StringUtils.EMPTY);
                     fileAttachmentMetadata.setFilePath(uploadPath);
                     fileAttachmentMetadataMapper.insert(fileAttachmentMetadata);
                     AttachmentModuleRelation record = new AttachmentModuleRelation();
@@ -3066,7 +3066,7 @@ public class TestCaseService {
             return;
         }
         if (!StringUtils.equals(demandId, "other")) {
-            demandName = "";
+            demandName = StringUtils.EMPTY;
         }
         SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH);
         TestCaseMapper mapper = sqlSession.getMapper(TestCaseMapper.class);
diff --git a/test-track/backend/src/main/java/io/metersphere/xmind/XmindCaseParser.java b/test-track/backend/src/main/java/io/metersphere/xmind/XmindCaseParser.java
index 090eb29180..1df10cf1e2 100644
--- a/test-track/backend/src/main/java/io/metersphere/xmind/XmindCaseParser.java
+++ b/test-track/backend/src/main/java/io/metersphere/xmind/XmindCaseParser.java
@@ -119,9 +119,9 @@ public class XmindCaseParser {
                 process.add(Translator.get("test_case_node_level_tip") +
                         TestCaseConstants.MAX_NODE_DEPTH + Translator.get("test_case_node_level"), nodePath);
             }
-            String path = "";
+            String path = StringUtils.EMPTY;
             for (int i = 0; i < nodes.length; i++) {
-                if (i != 0 && StringUtils.equals(nodes[i].trim(), "")) {
+                if (i != 0 && StringUtils.equals(nodes[i].trim(), StringUtils.EMPTY)) {
                     process.add(Translator.get("module_not_null"), path);
                 } else if (nodes[i].trim().length() > 100) {
                     process.add(Translator.get("module") + Translator.get("test_track.length_less_than") + "100", path + nodes[i].trim());
@@ -150,7 +150,7 @@ public class XmindCaseParser {
         //用例名称判断
         if (StringUtils.isEmpty(data.getName())) {
             validatePass = false;
-            process.add("name" + Translator.get("cannot_be_null"), nodePath + "");
+            process.add("name" + Translator.get("cannot_be_null"), nodePath + StringUtils.EMPTY);
         } else {
             if (data.getName().length() > 200) {
                 validatePass = false;
@@ -170,7 +170,7 @@ public class XmindCaseParser {
                 }
             }
             for (int i = 0; i < nodes.length; i++) {
-                if (i != 0 && StringUtils.equals(nodes[i].trim(), "")) {
+                if (i != 0 && StringUtils.equals(nodes[i].trim(), StringUtils.EMPTY)) {
                     validatePass = false;
                     process.add(Translator.get("test_case") + Translator.get("module_not_null"), nodePath + data.getName());
                     if (!errorPath.contains(nodePath)) {
@@ -315,7 +315,7 @@ public class XmindCaseParser {
         }
         Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
         Matcher result = pattern.matcher(str);
-        str = result.replaceAll("");
+        str = result.replaceAll(StringUtils.EMPTY);
         return str;
     }
 
@@ -339,8 +339,8 @@ public class XmindCaseParser {
             // 保持插入顺序，判断用例是否有相同的steps
             Map step = new LinkedHashMap();
             step.put("num", 1);
-            step.put("desc", "");
-            step.put("result", "");
+            step.put("desc", StringUtils.EMPTY);
+            step.put("result", StringUtils.EMPTY);
             jsonArray.add(step);
         }
         return JSON.toJSONString(jsonArray);
@@ -364,7 +364,7 @@ public class XmindCaseParser {
             return;
         }
         // 用例名称
-        String name = title.replace(tcArrs[0] + "：", "").replace(tcArrs[0] + ":", "");
+        String name = title.replace(tcArrs[0] + "：", StringUtils.EMPTY).replace(tcArrs[0] + ":", StringUtils.EMPTY);
         testCase.setName(name);
         testCase.setNodePath(nodePath.trim());