diff --git a/src/main/java/cn/teammodel/repository/LessonRecordRepository.java b/src/main/java/cn/teammodel/repository/LessonRecordRepository.java
index eda86af..5699994 100644
--- a/src/main/java/cn/teammodel/repository/LessonRecordRepository.java
+++ b/src/main/java/cn/teammodel/repository/LessonRecordRepository.java
@@ -16,7 +16,7 @@ public interface LessonRecordRepository extends CosmosRepository<LessonRecord, S
             "c.code = @code and " +
             "(IS_NULL(@startTime) or c.startTime >= @startTime) and " +
             "(IS_NULL(@endTime) or c.startTime <= @endTime) and "+
-            "(IS_NULL(@grade) or array_contains(c.grade,@grade) and " +
+            "(IS_NULL(@grade) or array_contains(c.grade,@grade)) and " +
             "c.status<>404 and "+
             "c.periodId = @periodId and "+
             "(IS_NULL(@subjectId) or c.subjectId = @subjectId) and"+