diff --git a/dsBaseRpc/Sql/t_base_student.sql b/dsBaseRpc/Sql/t_base_student.sql
index e476fc39..cda1b2e5 100644
--- a/dsBaseRpc/Sql/t_base_student.sql
+++ b/dsBaseRpc/Sql/t_base_student.sql
@@ -30,7 +30,7 @@ SELECT
 	`t_base_organization`.`xxbxlxm` AS `xxbxlxm`,
 	`t_base_organization`.`szdcxlxm` AS `szdcxlxm`,
 	`t_base_class`.`stage_id` AS `stage_id`,
-	cast( `t_base_class`.`rxnf` AS CHAR ( 4 ) charset utf8 ) AS `rxnf` ,
+	`t_base_class`.`rxnf` AS `rxnf`,
 	case t1.`b_use` when -1 then 1 else 0 end AS `del_flag`
 FROM
 	((