diff --git a/frontend/src/business/components/api/test/model/ScenarioModel.js b/frontend/src/business/components/api/test/model/ScenarioModel.js
index e0abd9d2e9..bbb129aa5a 100644
--- a/frontend/src/business/components/api/test/model/ScenarioModel.js
+++ b/frontend/src/business/components/api/test/model/ScenarioModel.js
@@ -96,8 +96,8 @@ export class Test extends BaseConfig {
     super();
     this.version = '1.0.0';
     this.id = uuid();
-    this.name = null;
-    this.projectId = null;
+    this.name = undefined;
+    this.projectId = undefined;
     this.scenarioDefinition = [];
 
     this.set(options);
@@ -122,8 +122,8 @@ export class Scenario extends BaseConfig {
   constructor(options) {
     super();
     this.id = uuid();
-    this.name = null;
-    this.url = null;
+    this.name = undefined;
+    this.url = undefined;
     this.variables = [];
     this.headers = [];
     this.requests = [];
@@ -143,14 +143,14 @@ export class Request extends BaseConfig {
   constructor(options) {
     super();
     this.id = uuid();
-    this.name = null;
-    this.url = null;
-    this.method = null;
+    this.name = undefined;
+    this.url = undefined;
+    this.method = undefined;
     this.parameters = [];
     this.headers = [];
-    this.body = null;
-    this.assertions = null;
-    this.extract = null;
+    this.body = undefined;
+    this.assertions = undefined;
+    this.extract = undefined;
 
     this.set(options);
     this.sets({parameters: KeyValue, headers: KeyValue}, options);
@@ -173,8 +173,8 @@ export class Request extends BaseConfig {
 export class Body extends BaseConfig {
   constructor(options) {
     super();
-    this.type = null;
-    this.raw = null;
+    this.type = undefined;
+    this.raw = undefined;
     this.kvs = [];
 
     this.set(options);
@@ -225,7 +225,7 @@ export class Assertions extends BaseConfig {
     super();
     this.text = [];
     this.regex = [];
-    this.duration = null;
+    this.duration = undefined;
 
     this.set(options);
     this.sets({text: Text, regex: Regex}, options);
@@ -248,9 +248,9 @@ export class AssertionType extends BaseConfig {
 export class Text extends AssertionType {
   constructor(options) {
     super(ASSERTION_TYPE.TEXT);
-    this.subject = null;
-    this.condition = null;
-    this.value = null;
+    this.subject = undefined;
+    this.condition = undefined;
+    this.value = undefined;
 
     this.set(options);
   }
@@ -259,9 +259,9 @@ export class Text extends AssertionType {
 export class Regex extends AssertionType {
   constructor(options) {
     super(ASSERTION_TYPE.REGEX);
-    this.subject = null;
-    this.expression = null;
-    this.description = null;
+    this.subject = undefined;
+    this.expression = undefined;
+    this.description = undefined;
 
     this.set(options);
   }
@@ -274,7 +274,7 @@ export class Regex extends AssertionType {
 export class ResponseTime extends AssertionType {
   constructor(options) {
     super(ASSERTION_TYPE.RESPONSE_TIME);
-    this.value = null;
+    this.value = undefined;
 
     this.set(options);
   }
@@ -311,10 +311,10 @@ export class ExtractType extends BaseConfig {
 export class ExtractCommon extends ExtractType {
   constructor(type, options) {
     super(type);
-    this.variable = null;
+    this.variable = undefined;
     this.value = ""; // ${variable}
-    this.expression = null;
-    this.description = null;
+    this.expression = undefined;
+    this.description = undefined;
 
     this.set(options);
   }
@@ -386,7 +386,7 @@ class JMeterTestPlan extends Element {
 
 class JMXGenerator {
   constructor(test) {
-    if (!test || !(test instanceof Test)) return null;
+    if (!test || !(test instanceof Test)) return undefined;
 
     if (!test.id) {
       test.id = "#NULL_TEST_ID#";
@@ -395,7 +395,8 @@ class JMXGenerator {
 
     let testPlan = new TestPlan(test.name);
     test.scenarioDefinition.forEach(scenario => {
-      let threadGroup = new ThreadGroup(scenario.name + SPLIT + scenario.id);
+      let testName = scenario.name ? scenario.name + SPLIT + scenario.id : SPLIT + scenario.id;
+      let threadGroup = new ThreadGroup(testName);
 
       this.addScenarioVariables(threadGroup, scenario);
 
@@ -405,7 +406,7 @@ class JMXGenerator {
         if (!request.isValid()) return;
 
         // test.id用于处理结果时区分属于哪个测试
-        let name = request.name + SPLIT + test.id;
+        let name = request.name ? request.name + SPLIT + test.id : SPLIT + test.id;
         let httpSamplerProxy = new HTTPSamplerProxy(name, new JMXRequest(request));
 
         this.addRequestHeader(httpSamplerProxy, request);