diff --git a/servers/boe-server-all/src/main/java/com/xboe/school/study/api/StudyCourseApi.java b/servers/boe-server-all/src/main/java/com/xboe/school/study/api/StudyCourseApi.java
index 9ef5f4d7..48264f20 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/school/study/api/StudyCourseApi.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/school/study/api/StudyCourseApi.java
@@ -347,7 +347,7 @@ public class StudyCourseApi extends ApiBaseController{
 			//studyService.appendStudyDuration(st);
 			return success(item.getId());
 		}
-		//如果不存在，就创建
+		//如果不存在，就创建,这种情况应该不存在
 		try {
 			sci.setAid(cuser.getAccountId());
 			sci.setAname(cuser.getName());
diff --git a/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyServiceImpl.java b/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyServiceImpl.java
index 0e3c9a24..4a8de3eb 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyServiceImpl.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyServiceImpl.java
@@ -109,8 +109,8 @@ public class StudyServiceImpl implements IStudyService{
 		}else {
 			//根据学习id和课程内容id更新
 			scItemDao.update(UpdateBuilder.from(StudyCourseItem.class)
-					.addUpdateField("studyDuration", "studyDuration"+duration,FieldUpdateType.EXPRESSION)
-					.addFilter(FieldFilters.eq("studyId", studyId))
+					.addUpdateField("studyDuration", "studyDuration+"+duration,FieldUpdateType.EXPRESSION)
+					.addFilter(FieldFilters.eq("studyId", studyId))  
 					.addFilter(FieldFilters.eq("contentId", courseContentId))
 					.builder());
 		}
@@ -197,9 +197,6 @@ public class StudyServiceImpl implements IStudyService{
 					UpdateBuilder.create("lastTime",now),
 					UpdateBuilder.create("status",status));
 		}
-		
-		
-		
 
 	}