diff --git a/servers/boe-server-all/src/main/java/com/xboe/school/study/dao/StudyCourseDao.java b/servers/boe-server-all/src/main/java/com/xboe/school/study/dao/StudyCourseDao.java
index d0985202..462f9c26 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/school/study/dao/StudyCourseDao.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/school/study/dao/StudyCourseDao.java
@@ -116,4 +116,8 @@ public class StudyCourseDao extends BaseDao<StudyCourse> {
 		
 		this.update(update.builder());
 	}
+
+	public StudyCourse findByCourseIdAndAid(String aid, String courseId) {
+		return this.findOne(FieldFilters.eq("aid",aid),FieldFilters.eq("courseId",courseId));
+	}
 }
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 8d0fe70b..80512d23 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
@@ -61,7 +61,10 @@ public class StudySignupServiceImpl implements IStudySignupService{
 	@Override
 	public void selfSignup(StudySignup signup) {
 		signup.setSignType(StudySignup.SIGNTYPE_SELF);
-		this.addSignup(signup);
+		StudyCourse sc=studyCourseDao.findByCourseIdAndAid(signup.getAid(), signup.getCourseId());
+		if (sc == null){
+			this.addSignup(signup);
+		}
 		//更新课程学习人数
 		courseDao.updateMultiFieldById(signup.getCourseId(),UpdateBuilder.create("studys", "studys+1",FieldUpdateType.EXPRESSION));
 	}