diff --git a/safety-eval-domain/src/main/java/org/qinan/safetyeval/domain/constant/ProjectRoleEnum.java b/safety-eval-domain/src/main/java/org/qinan/safetyeval/domain/constant/ProjectRoleEnum.java
index ab153e81..6e1f6b1f 100644
--- a/safety-eval-domain/src/main/java/org/qinan/safetyeval/domain/constant/ProjectRoleEnum.java
+++ b/safety-eval-domain/src/main/java/org/qinan/safetyeval/domain/constant/ProjectRoleEnum.java
@@ -52,6 +52,7 @@ public enum ProjectRoleEnum {
                 sb.append(stage.mas).append(",");
             }
         }
+        sb.deleteCharAt(sb.length() - 1);
         return sb.toString();
     }