diff --git a/example/app/material.go b/example/app/material.go
index 474871c..21c3a25 100644
--- a/example/app/material.go
+++ b/example/app/material.go
@@ -202,7 +202,7 @@ var materialCtr = Ctr{
 			pageSize = 10
 		}
 		leftJoin := Map{"[><]admin": "material.admin_id=admin.id"}
-		columnStr := "material.id,material.sn,material.name,material.img,material.count,material.used,material.saved,material.admin_id,admin.name AS admin_name,material.modify_time,material.state"
+		columnStr := "material.id,material.name,material.img,material.count,material.used,material.saved,material.admin_id,admin.name AS admin_name,material.modify_time,material.state"
 		where := Map{"ORDER": "modify_time DESC"}
 		count := that.Db.Count("material", where)
 		reData := that.Db.Page(page, pageSize).