diff --git a/services/me/implments/Product.service.impl.go b/services/me/implments/Product.service.impl.go
index 889af40..8c50866 100644
--- a/services/me/implments/Product.service.impl.go
+++ b/services/me/implments/Product.service.impl.go
@@ -13,6 +13,7 @@ import (
 	meta "LAPP_ACURA_MOM_BACKEND/meta/me"
 	baseModel "LAPP_ACURA_MOM_BACKEND/models/base"
 	model "LAPP_ACURA_MOM_BACKEND/models/me"
+	"fmt"
 )
 
 /******************************************************************************
@@ -708,6 +709,9 @@ func (impl *ProductServiceImplement) GenerateSnr(user *global.User, productId st
 	if product == nil {
 		return grmi.NewBusinessError("总成不存在")
 	}
+	if product.MachineCode == "" {
+		return grmi.NewBusinessError(fmt.Sprintf("总成%s的机种代码为空", product.ProductId))
+	}
 	snrDao := baseDal.NewSnrDAO(session, user.PlantNr, user.UserId)
 	snr, err := snrDao.SelectOne(conf.DbConfig.StandardSerialOrderSnr)
 	if err != nil {
@@ -717,9 +721,20 @@ func (impl *ProductServiceImplement) GenerateSnr(user *global.User, productId st
 		return grmi.NewBusinessError("标准流水号不存在")
 	}
 	newSnr := snr
-	snrId := productId + "_" + projectId + "_SerialOrderSnr"
-	newSnr.SnrId = snrId
+	snrId := product.MachineCode + "_SerialOrderSnr"
 	product.SerialOrderSnr = snrId
+	existSnr, err := snrDao.SelectOne(snrId)
+	if err != nil {
+		return grmi.NewBusinessError("查询流水号失败, 错误：" + err.Error())
+	}
+	if existSnr != nil {
+		err = dao.UpdateOne(product)
+		if err != nil {
+			return grmi.NewBusinessError("更新总成数据失败, 错误：" + err.Error())
+		}
+		return nil
+	}
+	newSnr.SnrId = snrId
 	if err = session.Begin(); err != nil {
 		return grmi.NewBusinessError("开启事务失败, 错误:" + err.Error())
 	}
@@ -739,6 +754,4 @@ func (impl *ProductServiceImplement) GenerateSnr(user *global.User, productId st
 		return grmi.NewBusinessError("保存流水号失败，错误:" + err.Error())
 	}
 	return nil
-
-
 }
\ No newline at end of file