diff --git a/web-infrastructure/src/main/resources/mapper/study/ClassMapper.xml b/web-infrastructure/src/main/resources/mapper/study/ClassMapper.xml
index 3d64472..a676650 100644
--- a/web-infrastructure/src/main/resources/mapper/study/ClassMapper.xml
+++ b/web-infrastructure/src/main/resources/mapper/study/ClassMapper.xml
@@ -227,7 +227,7 @@
             <if test="params.examination != null and params.examination !='' ">
                 and c.examination = #{params.examination}
             </if>
-            <if test="params.examState != null and params.examState !='' ">
+            <if test="params.examState != null  ">
                 <if test = "params.examState == 0"><!-- 待考试：班级结束前，且未通过考试 -->
                     and c.examination = 1 and s.state = 0 and c.end_time > now()
                 </if>