diff --git a/src/main/resources/mapper/system/BuyMapper.xml b/src/main/resources/mapper/system/BuyMapper.xml
index 1faea4b..82fbbf9 100644
--- a/src/main/resources/mapper/system/BuyMapper.xml
+++ b/src/main/resources/mapper/system/BuyMapper.xml
@@ -6,6 +6,6 @@
 
 
     <update id="doBuyInterface">
-        update connector set connector_frequency=connector_frequency+#{connectorFrequency},connector_residue_degree=connector_residue_degree+#{connectorFrequency} where connector_id=#{connectorId}
+        update connector set connector_residue_degree=connector_residue_degree+#{connectorFrequency},connector_frequency=connector_frequency+#{connectorFrequency} where connector_id=#{connectorId}
     </update>
 </mapper>