diff --git a/internal/service/agent/agent_service.go b/internal/service/agent/agent_service.go
index bdf10e9..7f862c0 100644
--- a/internal/service/agent/agent_service.go
+++ b/internal/service/agent/agent_service.go
@@ -185,11 +185,11 @@ func (s *AgentServiceV1) AgentPutInfoReq(ctx context.Context, req *v1.AgentPutIn
 		oldBalance = utils.RevertBalance(user.Balance, user.Edges.Agent.Rate)
 		tx.SysAgent.UpdateOne(user.Edges.Agent).SetLevel(req.Level).SetRate(req.Rate).SaveX(ctx)
 	}
+	err = tx.Commit()
 	//按照新费率计算余额
 	newBalance := utils.TransformBalance(oldBalance, req.Rate)
 	// 6. 更新用户余额
 	balance.BalanceService.ChangeUserBalance(ctx, user.ID, newBalance.Sub(oldBalance))
-	err = tx.Commit()
 	utils.OkOrPanic(err, func(err error) error {
 		return oops.
 			WithContext(ctx).
diff --git a/internal/service/balance/balance_service.go b/internal/service/balance/balance_service.go
index d953d8c..89ae160 100644
--- a/internal/service/balance/balance_service.go
+++ b/internal/service/balance/balance_service.go
@@ -4,33 +4,38 @@ import (
 	"context"
 	"likedream-goframe/internal/common/errors"
 	"likedream-goframe/internal/db"
+	"likedream-goframe/internal/ent"
 	"likedream-goframe/internal/ent/sysuser"
 	"likedream-goframe/internal/utils"
-	"sync"
 
-	"github.com/samber/oops"
 	"github.com/shopspring/decimal"
 )
 
-var BalanceService = &BalanceServiceV1{
-	lock: sync.Mutex{},
-}
+var BalanceService = &BalanceServiceV1{}
 
 type BalanceServiceV1 struct {
-	lock sync.Mutex
 }
 
-func (v *BalanceServiceV1) ChangeUserBalance(ctx context.Context, userId int64, balance decimal.Decimal) {
-	v.lock.Lock()
-	defer v.lock.Unlock()
-	tx, err := db.Global.Tx(ctx)
-	utils.OkOrPanic(err, oops.WithContext(ctx).Wrap)
-	defer tx.Rollback()
-	user := tx.SysUser.Query().Where(sysuser.ID(userId)).WithRoles().OnlyX(ctx)
-	newBalance := user.Balance.Add(balance)
-	if newBalance.LessThan(decimal.Zero) {
-		utils.OkOrPanic(errors.NewBusinessError(400, "余额不足"))
-	}
-	tx.SysUser.Update().Where(sysuser.ID(userId)).SetBalance(newBalance).SaveX(ctx)
-	tx.Commit()
+func (v *BalanceServiceV1) ChangeUserBalance(ctx context.Context, userId int64, balance decimal.Decimal) error {
+	return db.WithTx(ctx, func(c context.Context, tx *ent.Tx) {
+		// 使用 SELECT ... FOR UPDATE 锁定用户记录
+		user, err := tx.SysUser.Query().
+			Where(sysuser.ID(userId)).
+			ForUpdate().
+			Only(ctx)
+		if err != nil {
+			utils.OkOrPanic(err)
+		}
+
+		newBalance := user.Balance.Add(balance)
+		if newBalance.LessThan(decimal.Zero) {
+			utils.OkOrPanic(errors.NewBusinessError(400, "余额不足"))
+		}
+
+		// 更新余额
+		tx.SysUser.Update().
+			Where(sysuser.ID(userId)).
+			SetBalance(newBalance).
+			ExecX(ctx)
+	}, nil)
 }