diff --git a/modules/library/api_lvup.go b/modules/library/api_lvup.go
index 9bc6bd7f7..ce9a42be2 100644
--- a/modules/library/api_lvup.go
+++ b/modules/library/api_lvup.go
@@ -49,7 +49,7 @@ func (this *apiComp) FetterLvUp(session comm.IUserSession, req *pb.LibraryFetter
 		return
 	}
 
-	if _, ok := fetter.Prize[fetter.Fidlv]; !ok {
+	if _, ok := fetter.Prize[fetter.Fidlv]; ok {
 		code = pb.ErrorCode_LibraryReward
 		return
 	}