diff --git a/bonus-modules/bonus-material-mall/src/main/resources/mapper/material/back/BackChangeMapper.xml b/bonus-modules/bonus-material-mall/src/main/resources/mapper/material/back/BackChangeMapper.xml
index c335770..7cead97 100644
--- a/bonus-modules/bonus-material-mall/src/main/resources/mapper/material/back/BackChangeMapper.xml
+++ b/bonus-modules/bonus-material-mall/src/main/resources/mapper/material/back/BackChangeMapper.xml
@@ -250,6 +250,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
                 AND cd.pro_code = #{proCode}
             </if>
         </where>
+        GROUP BY tl.id
     </select>
 
     <select id="getMonthMaxOrderByDate" resultType="java.lang.Integer">