diff --git a/api/submissions.go b/api/submissions.go
index 5efed2c..90354af 100644
--- a/api/submissions.go
+++ b/api/submissions.go
@@ -13,18 +13,19 @@ import (
 func hasAlreadySolved(uid int, cid int) (exists bool) {
 	Link()
 	DB := db.DBsnctf
-	err := DB.Raw("SELECT EXISTS(SELECT 1 FROM solve WHERE uid=? AND cid=?)",uid,cid).Scan(&exists).Error
-	if  err != nil {
+	err := DB.Raw("SELECT EXISTS(SELECT 1 FROM solve WHERE uid=? AND cid=?)", uid, cid).Scan(&exists).Error
+	if err != nil {
 		return false
 	}
 	return exists
 }
+
 // isChallengeExisted 检查数据库中是否存在某个题目。
 func isChallengeExisted(id int) (exists bool) {
 	Link()
 	DB := db.DBsnctf
 	command := "SELECT EXISTS(SELECT 1 FROM challenge WHERE id = ?);"
-	err := DB.Raw(command,id).Scan(&exists).Error
+	err := DB.Raw(command, id).Scan(&exists).Error
 	if err != nil {
 		return false
 	}
@@ -48,7 +49,7 @@ func addSubmission(s *Submission) error {
 func getFlag(id int) (flag string, err error) {
 	Link()
 	DB := db.DBsnctf
-	err = DB.Table("challenge").Select("flag").Where("id = ?",id).Find(&flag).Error
+	err = DB.Table("challenge").Select("flag").Where("id = ?", id).Find(&flag).Error
 	if err != nil {
 		return "", err
 	}
@@ -81,10 +82,11 @@ func addUserScore(username string, cid int) error {
 	}
 	return nil
 }
+
 // updateUserScores 操作数据库更新解出用户的分数。
 func updateUserScores(reducedScore, cid int) error {
 
-	DB:=db.DBsnctf
+	DB := db.DBsnctf
 	command := "UPDATE score SET score=score-? WHERE EXISTS(SELECT 1 FROM user,solve WHERE user.id=solve.uid AND score.username=user.username AND solve.cid=?);"
 	err := DB.Exec(command, reducedScore, cid).Error
 
@@ -127,12 +129,12 @@ func SubmitFlag(c *gin.Context) {
 		return
 	}
 
-	session,err := Store.Get(c.Request, "SNCTFSESSID")
+	session, err := Store.Get(c.Request, "SNCTFSESSID")
 	if err != nil {
 		c.JSON(400, gin.H{"code": 400, "msg": "GET SNCTFSESSID error!"})
 		return
 	}
-	user,ok := session.Values["user"].(User)
+	user, ok := session.Values["user"].(User)
 	if !ok {
 		c.JSON(400, gin.H{"code": 400, "msg": "GET user error!"})
 		return
@@ -158,21 +160,21 @@ func SubmitFlag(c *gin.Context) {
 	}
 	// 是否已经解出该题
 	if hasAlreadySolved(user.ID, request.Cid) {
-		c.JSON(400, gin.H{"code": 400, "msg": "Already solved!"})
+		c.JSON(200, gin.H{"code": 400, "msg": "Already solved!"})
 		return
 	}
 	// 获取flag
 	flag, err := getFlag(request.Cid)
 	if err != nil {
 		fmt.Println(err)
-		c.JSON(400, gin.H{"code": 400, "msg": "Get flag failure!"})
+		c.JSON(200, gin.H{"code": 400, "msg": "Get flag failure!"})
 		return
 	}
 	// 检查flag是否正确
 	if flag != request.Flag {
-		c.JSON(400, gin.H{"code": 400, "msg": "Wrong flag!"})
+		c.JSON(200, gin.H{"code": 400, "msg": "Wrong flag!"})
 		return
-	}else {
+	} else {
 		// Solve记录
 		solve := &Solve{
 			UserID:      user.ID,
@@ -181,7 +183,7 @@ func SubmitFlag(c *gin.Context) {
 		}
 		err = addSolve(solve)
 		if err != nil {
-			c.JSON(400, gin.H{"code": 400, "msg": "Record solve failure!"})
+			c.JSON(200, gin.H{"code": 400, "msg": "Record solve failure!"})
 			return
 		}
 		//加分
@@ -208,4 +210,4 @@ func SubmitFlag(c *gin.Context) {
 
 	}
 
-}
\ No newline at end of file
+}