diff --git a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/ClassInfo/ClassInfoService.cs b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/ClassInfo/ClassInfoService.cs
index 847365e5c..366e8bede 100644
--- a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/ClassInfo/ClassInfoService.cs	
+++ b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/ClassInfo/ClassInfoService.cs	
@@ -362,6 +362,7 @@ namespace Learun.Application.TwoDevelopment.EducationalAdministration
             {
                 var cn = db.FindEntity<ClassInfoEntity>(x => x.ClassNo == classno);
                 if (cn == null) throw new Exception("未找到班级");
+                if(!cn.DeviceCode.IsEmpty()) throw new Exception("请勿重复邦定！");
                 cn.DeviceCode = dev;
                 db.Update(cn);