diff --git a/server/wheelserver/api/v1/bag/bag.go b/server/wheelserver/api/v1/bag/bag.go
index 0135919d..81aafbfd 100644
--- a/server/wheelserver/api/v1/bag/bag.go
+++ b/server/wheelserver/api/v1/bag/bag.go
@@ -43,7 +43,7 @@ func (this *BagApi) UseItem(c *gin.Context) {
 	}
 	reqJson := struct {
 		ItemUniId string `json:"item_uniid"`
-		ItemNum string `json:"item_num"`
+		ItemNum int32 `json:"item_num"`
 	}{}
 	if err := c.ShouldBindJSON(&reqJson); err != nil {
 		f5.RspErr(c, 401, "params parse error")
@@ -57,7 +57,11 @@ func (this *BagApi) UseItem(c *gin.Context) {
 		f5.RspErr(c, 500, "server internal error")
 		return
 	} else if !found {
-		f5.RspErr(c, 1, "server internal error")
+		f5.RspErr(c, 1, "item not found")
+		return
+	}
+	if bagItem.ItemNum < reqJson.ItemNum {
+		f5.RspErr(c, 1, "item not enough")
 		return
 	}
 	c.JSON(200, rspObj)