diff --git a/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudySignupServiceImpl.java b/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudySignupServiceImpl.java
index b2851a6c..d9345ba2 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudySignupServiceImpl.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudySignupServiceImpl.java
@@ -152,7 +152,7 @@ public class StudySignupServiceImpl implements IStudySignupService{
 				scitem.setProgress(0);
 				scitem.setScore(0f);
 				scitem.setStatus(1);
-				scitem.setContentId((String) objs[0]);
+				scitem.setContentId(objs[0].toString());
 				scitem.setStudyId(signup.getStudyId());
 				// 如果需要，可以取消注释以下行来设置contentName
 				// scitem.setContentName(c.getContentName());