diff --git a/src/main/resources/mapper/EntrustmentMapper.xml b/src/main/resources/mapper/EntrustmentMapper.xml
index 23641b2..26fc1ec 100644
--- a/src/main/resources/mapper/EntrustmentMapper.xml
+++ b/src/main/resources/mapper/EntrustmentMapper.xml
@@ -256,14 +256,18 @@
 
   <!-- 取最大委托号, 目的是为了生成新的委托号 -->
   <select id="getMaxEntrustmentNo" parameterType="String" resultType="java.lang.String">
-    SELECT MAX(entrustment_no) AS maxno
+    SELECT entrustment_no
     FROM b_entrustment
-    WHERE entrustment_no LIKE concat(#{prefix}, '%')
+    WHERE entrustment_no LIKE CONCAT(#{prefix}, '%')
+    ORDER BY CAST(SUBSTRING_INDEX(entrustment_no, '-', -1) AS UNSIGNED) DESC
+    LIMIT 1
   </select>
   <select id="getMaxEntrustmentNoNew"  parameterType="String" resultType="java.lang.String">
-    SELECT MAX(entrustment_no) AS maxno
+    SELECT entrustment_no
     FROM b_entrustment
-    WHERE entrustment_no LIKE concat(#{prefix}, '%')
+    WHERE entrustment_no LIKE CONCAT(#{prefix}, '%')
+    ORDER BY CAST(SUBSTRING_INDEX(entrustment_no, '-', -1) AS UNSIGNED) DESC
+    LIMIT 1
   </select>
   <select id="getMaxEntrustAcceptNo" parameterType="String"  resultType="java.lang.String">
     SELECT MAX(CAST(SUBSTRING(accept_no, 6) AS UNSIGNED)) AS maxno