diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/InsertableProvider/InsertNavMethodInfo.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/InsertableProvider/InsertNavMethodInfo.cs
index 2622b2ed5..601c76f07 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/InsertableProvider/InsertNavMethodInfo.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/InsertableProvider/InsertNavMethodInfo.cs
@@ -26,7 +26,7 @@ namespace SqlSugar
         }
         public InsertNavMethodInfo ThenIncludeByNameString(string navMemberName, UpdateNavOptions updateNavOptions = null)
         {
-            var type = MethodInfos.GetType().GetGenericArguments()[0];
+            var type = MethodInfos.GetType().GetGenericArguments()[1];
             var entityInfo = this.Context.EntityMaintenance.GetEntityInfo(type);
             Type properyItemType;
             bool isList;
diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/UpdateProvider/UpdateNavMethodInfo.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/UpdateProvider/UpdateNavMethodInfo.cs
index 15f4b9e8f..949c1d27f 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/UpdateProvider/UpdateNavMethodInfo.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/UpdateProvider/UpdateNavMethodInfo.cs
@@ -27,7 +27,7 @@ namespace SqlSugar
         }
         public UpdateNavMethodInfo ThenIncludeByNameString(string navMemberName, UpdateNavOptions updateNavOptions = null)
         {
-            var type = MethodInfos.GetType().GetGenericArguments()[0];
+            var type = MethodInfos.GetType().GetGenericArguments()[1];
             var entityInfo = this.Context.EntityMaintenance.GetEntityInfo(type);
             Type properyItemType;
             bool isList;