diff --git a/FreeSql/FreeSql.xml b/FreeSql/FreeSql.xml
index 9b5affeb..88245752 100644
--- a/FreeSql/FreeSql.xml
+++ b/FreeSql/FreeSql.xml
@@ -1445,6 +1445,14 @@
             <param name="providerType">提供者的类型，一般不需要指定，如果一直提示“缺少 FreeSql 数据库实现包：FreeSql.Provider.MySql.dll，可前往 nuget 下载”的错误，说明反射获取不到类型，此时该参数可排上用场<para></para>例如：typeof(FreeSql.SqlServer.SqlServerProvider&lt;&gt;)</param>
             <returns></returns>
         </member>
+        <member name="M:FreeSql.FreeSqlBuilder.UseCustomTableEntityCacheFactory(System.Func{System.Collections.Concurrent.ConcurrentDictionary{FreeSql.DataType,System.Collections.Concurrent.ConcurrentDictionary{System.Type,FreeSql.Internal.Model.TableInfo}}})">
+            <summary>
+            用于指定自定义实现TableEntiy 的缓存集合
+            解决多实例下相同类型映射到不同表的问题
+            </summary>
+            <param name="factory"></param>
+            <returns></returns>
+        </member>
         <member name="M:FreeSql.FreeSqlBuilder.UseAdoConnectionPool(System.Boolean)">
             <summary>
             使用原始连接池（ado.net、odbc、oledb）<para></para>
@@ -5002,6 +5010,11 @@
             </summary>
             <returns></returns>
         </member>
+        <member name="F:FreeSql.Internal.Utils.ChacheTableEntityFactory">
+            <summary>
+            用于解决多实例情况下的静态集合缓存问题
+            </summary>
+        </member>
         <member name="T:FreeSql.CoreStrings">
             <summary>
                 <para>
diff --git a/FreeSql/Internal/UtilsExpressionTree.cs b/FreeSql/Internal/UtilsExpressionTree.cs
index ebd6d9ea..03155a2e 100644
--- a/FreeSql/Internal/UtilsExpressionTree.cs
+++ b/FreeSql/Internal/UtilsExpressionTree.cs
@@ -23,7 +23,7 @@ namespace FreeSql.Internal
         /// 用于解决多实例情况下的静态集合缓存问题
         /// </summary>
         public static Func<ConcurrentDictionary<DataType, ConcurrentDictionary<Type, TableInfo>>> ChacheTableEntityFactory = null;
-        private static ConcurrentDictionary<DataType, ConcurrentDictionary<Type, TableInfo>> __cacheGetTableByEntity;
+        private static ConcurrentDictionary<DataType, ConcurrentDictionary<Type, TableInfo>> __cacheGetTableByEntity = new ConcurrentDictionary<DataType, ConcurrentDictionary<Type, TableInfo>>();
         public static ConcurrentDictionary<DataType, ConcurrentDictionary<Type, TableInfo>> _cacheGetTableByEntity
         {
             get
@@ -32,7 +32,6 @@ namespace FreeSql.Internal
                 {
                     return ChacheTableEntityFactory.Invoke();
                 }
-                __cacheGetTableByEntity ??= new ConcurrentDictionary<DataType, ConcurrentDictionary<Type, TableInfo>>();
                 return __cacheGetTableByEntity;
             }
         }