diff --git a/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java b/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java
index 8b2e781d7e..d5c1bd341d 100644
--- a/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java
+++ b/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java
@@ -1170,7 +1170,7 @@ public class ApiAutomationService {
 
         if (CollectionUtils.isNotEmpty(list)) {
             LogUtil.error("import scenario fail, custom num is exist: " + scenarioWithBLOBs.getCustomNum());
-            return scenarioWithBLOBs;
+            MSException.throwException(Translator.get("import_fail_custom_num_exists") + ": " + scenarioWithBLOBs.getCustomNum());
         }
 
         if (StringUtils.equals("fullCoverage", apiTestImportRequest.getModeId())) {
diff --git a/backend/src/main/resources/i18n/messages_en_US.properties b/backend/src/main/resources/i18n/messages_en_US.properties
index 25fe2c3114..a3b0b3f567 100644
--- a/backend/src/main/resources/i18n/messages_en_US.properties
+++ b/backend/src/main/resources/i18n/messages_en_US.properties
@@ -223,6 +223,7 @@ delete_check_reference_by=be referenced by Scenario
 not_execute=Not execute
 execute_not_pass=Not pass
 execute_pass=Pass
+import_fail_custom_num_exists=import fail, custom num is exists
 #authsource
 authsource_name_already_exists=Authentication source name already exists
 authsource_name_is_null=Authentication source name cannot be empty
diff --git a/backend/src/main/resources/i18n/messages_zh_CN.properties b/backend/src/main/resources/i18n/messages_zh_CN.properties
index 27257a5f8f..e887ad8d6d 100644
--- a/backend/src/main/resources/i18n/messages_zh_CN.properties
+++ b/backend/src/main/resources/i18n/messages_zh_CN.properties
@@ -223,6 +223,7 @@ delete_check_reference_by=被场景引用
 not_execute=未执行
 execute_not_pass=未通过
 execute_pass=通过
+import_fail_custom_num_exists=导入失败，自定义ID已存在
 #authsource
 authsource_name_already_exists=认证源名称已经存在
 authsource_name_is_null=认证源名称不能为空
diff --git a/backend/src/main/resources/i18n/messages_zh_TW.properties b/backend/src/main/resources/i18n/messages_zh_TW.properties
index 962c5f6bac..137b8bc200 100644
--- a/backend/src/main/resources/i18n/messages_zh_TW.properties
+++ b/backend/src/main/resources/i18n/messages_zh_TW.properties
@@ -223,6 +223,7 @@ delete_check_reference_by=被場景引用
 not_execute=未執行
 execute_not_pass=未通過
 execute_pass=通過
+import_fail_custom_num_exists=導入失敗，自定義ID已存在
 #authsource
 authsource_name_already_exists=認證源名稱已經存在
 authsource_name_is_null=認證源名稱不能為空