diff --git a/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleMemberValidator.java b/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleMemberValidator.java
index 88dcf9d4d9..e36d1a3b36 100644
--- a/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleMemberValidator.java
+++ b/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleMemberValidator.java
@@ -7,6 +7,7 @@ import io.metersphere.sdk.util.Translator;
 import io.metersphere.system.dto.sdk.TemplateCustomFieldDTO;
 import org.apache.commons.lang3.StringUtils;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -32,7 +33,7 @@ public class CustomFieldMultipleMemberValidator extends CustomFieldMemberValidat
     @Override
     public Object parse2Key(String keyOrValuesStr, TemplateCustomFieldDTO customField) {
         if (StringUtils.isBlank(keyOrValuesStr)) {
-            return StringUtils.EMPTY;
+            return JSON.toJSONString(new ArrayList<>());
         }
         List<String> keyOrValues = parse2Array(keyOrValuesStr);
 
diff --git a/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleSelectValidator.java b/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleSelectValidator.java
index b55d2bf97b..f4b3540457 100644
--- a/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleSelectValidator.java
+++ b/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleSelectValidator.java
@@ -7,6 +7,7 @@ import io.metersphere.sdk.util.Translator;
 import io.metersphere.system.dto.sdk.TemplateCustomFieldDTO;
 import org.apache.commons.lang3.StringUtils;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -35,7 +36,7 @@ public class CustomFieldMultipleSelectValidator extends CustomFieldSelectValidat
     @Override
     public Object parse2Key(String keyOrValuesStr, TemplateCustomFieldDTO customField) {
         if (StringUtils.isBlank(keyOrValuesStr)) {
-            return StringUtils.EMPTY;
+            return JSON.toJSONString(new ArrayList<>());
         }
         List<String> keyOrValues = parse2Array(keyOrValuesStr);
         Map<String, String> nameMap = optionTextMapCache.get(customField.getFieldId());
diff --git a/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleTextValidator.java b/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleTextValidator.java
index 833c1535f6..17d573da8b 100644
--- a/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleTextValidator.java
+++ b/backend/services/case-management/src/main/java/io/metersphere/functional/excel/validate/CustomFieldMultipleTextValidator.java
@@ -7,6 +7,7 @@ import io.metersphere.sdk.util.Translator;
 import io.metersphere.system.dto.sdk.TemplateCustomFieldDTO;
 import org.apache.commons.lang3.StringUtils;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -33,7 +34,7 @@ public class CustomFieldMultipleTextValidator extends AbstractCustomFieldValidat
     @Override
     public Object parse2Key(String keyOrValuesStr, TemplateCustomFieldDTO customField) {
         if (StringUtils.isBlank(keyOrValuesStr)) {
-            return StringUtils.EMPTY;
+            return JSON.toJSONString(new ArrayList<>());
         }
         List<String> keyOrValues = parse2Array(keyOrValuesStr);