diff --git a/README.md b/README.md
index 9a93004e..6183a78c 100644
--- a/README.md
+++ b/README.md
@@ -602,7 +602,7 @@ var list = new List<SysUserMod>();
                 _defaultTableDbContext.SaveChanges();
           //or
             var dbContexts = _defaultTableDbContext.BulkShardingEnumerable(list);
-            using (var tran = _defaultTableDbContext.BeginTransaction())
+            using (var tran = _defaultTableDbContext.Database.BeginTransaction())
             {
                     foreach (var dataSourceMap in dbContexts)
                     {