diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToOne.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToOne.cs
index 8fdf3e27e..00edc927b 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToOne.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToOne.cs
@@ -35,7 +35,7 @@ namespace SqlSugar
                         }
 
                     }
-                    if (!IsDefaultValue(navPropertyValue)&& isManyPk==false)
+                    if (!IsDefaultValue(navPropertyValue)&& isManyPk==false&& parentPkColumn.IsIdentity==false)
                     {
                         this._Context.Updateable<DbTableInfo>
                            ().AS(parentEntity.DbTableName)