diff --git a/server/service/staff_salary.go b/server/service/staff_salary.go
index 973c69b..d31b103 100644
--- a/server/service/staff_salary.go
+++ b/server/service/staff_salary.go
@@ -67,7 +67,7 @@ func (s *StaffSalary) Create(sess *session.AdminSession, req *api.CreateSalaryRe
 	session.CheckDBError(err)
 	salaryLast := cast.ToInt(config.GetCorpConfig(sess.GetCorpId(), "salary_latest", 31))
 
-	lastMonth := cast.ToInt(time.Now().AddDate(0, -1, 0).Format("200601"))
+	lastMonth := cast.ToInt(time.Now().AddDate(0, 0, -time.Now().Day()).Format("200601"))
 	if cast.ToInt(req.Month) < lastMonth ||
 		(cast.ToInt(req.Month) == lastMonth && time.Now().Day() > salaryLast) {
 		panic(config.ErrTimeExceed.New().Append(fmt.Sprintf("salaryLast=%d", salaryLast)))