diff --git a/Examples/repository_01/Controllers/SongController.cs b/Examples/repository_01/Controllers/SongController.cs
index 20b0d825..36660b75 100644
--- a/Examples/repository_01/Controllers/SongController.cs
+++ b/Examples/repository_01/Controllers/SongController.cs
@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using repository_01.Repositorys;
 using restful.Entitys;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
@@ -15,6 +16,12 @@ namespace restful.Controllers {
 
 		public SongsController(IFreeSql fsql) {
 			_songRepository = new SongRepository(fsql);
+
+			//test code
+			var curd1 = fsql.GetRepository<Song, int>();
+			var curd2 = fsql.GetRepository<Song, string>();
+			var curd3 = fsql.GetRepository<Song, Guid>();
+			var curd4 = fsql.GetGuidRepository<Song>();
 		}
 
 		[HttpGet]
diff --git a/FreeSql.Repository/BaseRepository.cs b/FreeSql.Repository/BaseRepository.cs
index ce2fa027..de5fd837 100644
--- a/FreeSql.Repository/BaseRepository.cs
+++ b/FreeSql.Repository/BaseRepository.cs
@@ -40,7 +40,7 @@ namespace FreeSql {
 			}
 		}
 
-		public virtual List<TEntity> Insert(List<TEntity> entity) {
+		public virtual List<TEntity> Insert(IEnumerable<TEntity> entity) {
 			switch (_fsql.Ado.DataType) {
 				case DataType.SqlServer:
 				case DataType.PostgreSQL:
@@ -66,7 +66,7 @@ namespace FreeSql {
 			}
 		}
 
-		public virtual Task<List<TEntity>> InsertAsync(List<TEntity> entity) {
+		public virtual Task<List<TEntity>> InsertAsync(IEnumerable<TEntity> entity) {
 			switch (_fsql.Ado.DataType) {
 				case DataType.SqlServer:
 				case DataType.PostgreSQL:
diff --git a/FreeSql.Repository/FreeSql.Repository.csproj b/FreeSql.Repository/FreeSql.Repository.csproj
index 3c29684a..903f7229 100644
--- a/FreeSql.Repository/FreeSql.Repository.csproj
+++ b/FreeSql.Repository/FreeSql.Repository.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <Version>0.1.5</Version>
+    <Version>0.1.5.3</Version>
     <Authors>YeXiangQin</Authors>
     <Description>FreeSql 通用仓库层现实，支持 MySql/SqlServer/PostgreSQL/Oracle/Sqlite 数据库。</Description>
     <PackageProjectUrl>https://github.com/2881099/FreeSql</PackageProjectUrl>
diff --git a/FreeSql.Repository/GuidRepository.cs b/FreeSql.Repository/GuidRepository.cs
index 24b40492..e2e30ebd 100644
--- a/FreeSql.Repository/GuidRepository.cs
+++ b/FreeSql.Repository/GuidRepository.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -11,14 +12,14 @@ namespace FreeSql {
 		public GuidRepository(IFreeSql fsql) : base(fsql) {
 		}
 
-		public override List<TEntity> Insert(List<TEntity> entity) {
+		public override List<TEntity> Insert(IEnumerable<TEntity> entity) {
 			_fsql.Insert<TEntity>().AppendData(entity).ExecuteAffrows();
-			return entity;
+			return entity.ToList();
 		}
 
-		async public override Task<List<TEntity>> InsertAsync(List<TEntity> entity) {
+		async public override Task<List<TEntity>> InsertAsync(IEnumerable<TEntity> entity) {
 			await _fsql.Insert<TEntity>().AppendData(entity).ExecuteAffrowsAsync();
-			return entity;
+			return entity.ToList();
 		}
 
 		public override TEntity Insert(TEntity entity) {
diff --git a/FreeSql.Repository/IBasicRepository.cs b/FreeSql.Repository/IBasicRepository.cs
index db2f0a17..63db1f7c 100644
--- a/FreeSql.Repository/IBasicRepository.cs
+++ b/FreeSql.Repository/IBasicRepository.cs
@@ -6,11 +6,11 @@ namespace FreeSql {
 		where TEntity : class {
 		TEntity Insert(TEntity entity);
 
-		List<TEntity> Insert(List<TEntity> entity);
+		List<TEntity> Insert(IEnumerable<TEntity> entity);
 
 		Task<TEntity> InsertAsync(TEntity entity);
 
-		Task<List<TEntity>> InsertAsync(List<TEntity> entity);
+		Task<List<TEntity>> InsertAsync(IEnumerable<TEntity> entity);
 
 		int Update(TEntity entity);
 
diff --git a/FreeSql.Repository/IFreeSqlExtenssions.cs b/FreeSql.Repository/IFreeSqlExtenssions.cs
index 033f1b16..36edc276 100644
--- a/FreeSql.Repository/IFreeSqlExtenssions.cs
+++ b/FreeSql.Repository/IFreeSqlExtenssions.cs
@@ -1,6 +1,7 @@
 using FreeSql;
 using System;
 using System.Collections.Generic;
+using System.Collections.Concurrent;
 using System.Text;
 
 public static class IFreeSqlExtenssions {
@@ -12,10 +13,12 @@ public static class IFreeSqlExtenssions {
 	/// <typeparam name="TKey"></typeparam>
 	/// <param name="that"></param>
 	/// <returns></returns>
-	public static IRepository<TEntity, TKey> GetRepository<TEntity, TKey>(this IFreeSql that) where TEntity : class {
+	public static DefaultRepository<TEntity, TKey> GetRepository<TEntity, TKey>(this IFreeSql that) where TEntity : class {
 
-		return new DefaultRepository<TEntity, TKey>(that);
+		return dicGetRepository.GetOrAdd(typeof(TEntity), type1 => new ConcurrentDictionary<Type, IRepository>())
+			.GetOrAdd(typeof(TKey), type2 => new DefaultRepository<TEntity, TKey>(that)) as DefaultRepository<TEntity, TKey>;
 	}
+	static ConcurrentDictionary<Type, ConcurrentDictionary<Type, IRepository>> dicGetRepository = new ConcurrentDictionary<Type, ConcurrentDictionary<Type, IRepository>>();
 
 	/// <summary>
 	/// 返回仓库类，适用 Insert 方法无须返回插入的数据
@@ -23,8 +26,9 @@ public static class IFreeSqlExtenssions {
 	/// <typeparam name="TEntity"></typeparam>
 	/// <param name="that"></param>
 	/// <returns></returns>
-	public static IRepository<TEntity, Guid> GetGuidRepository<TEntity>(this IFreeSql that) where TEntity : class {
+	public static GuidRepository<TEntity> GetGuidRepository<TEntity>(this IFreeSql that) where TEntity : class {
 
-		return new GuidRepository<TEntity>(that);
+		return dicGetGuidRepository.GetOrAdd(typeof(TEntity), type1 => new GuidRepository<TEntity>(that)) as GuidRepository<TEntity>;
 	}
+	static ConcurrentDictionary<Type, IRepository> dicGetGuidRepository = new ConcurrentDictionary<Type, IRepository>();
 }
\ No newline at end of file
diff --git a/FreeSql.Tests/FreeSql.Tests.csproj b/FreeSql.Tests/FreeSql.Tests.csproj
index 64205046..8924c76b 100644
--- a/FreeSql.Tests/FreeSql.Tests.csproj
+++ b/FreeSql.Tests/FreeSql.Tests.csproj
@@ -13,6 +13,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\FreeSql.Repository\FreeSql.Repository.csproj" />
     <ProjectReference Include="..\FreeSql\FreeSql.csproj" />
   </ItemGroup>
 	
diff --git a/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs b/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
index c38cac49..5cac46fc 100644
--- a/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
+++ b/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
@@ -9,8 +9,55 @@ using Xunit;
 namespace FreeSql.Tests.Sqlite {
 	public class SqliteCodeFirstTest {
 
+
+		class Topic {
+			public Guid Id { get; set; }
+			public string Title { get; set; }
+			public string Content { get; set; }
+			public DateTime CreateTime { get; set; }
+		}
+		[Table(Name = "xxxtb.Comment")]
+		class Comment {
+			public Guid Id { get; set; }
+			public Guid TopicId { get; set; }
+			public Topic Topic { get; set; }
+			public string Nickname { get; set; }
+			public string Content { get; set; }
+			public DateTime CreateTime { get; set; }
+		}
+
+
 		[Fact]
 		public void AddField() {
+
+			//��һ�� FreeSql.Repository ��չ����dotnet add package FreeSql.Repository
+			var topicRepository = g.sqlite.GetGuidRepository<Topic>();
+			var commentRepository = g.sqlite.GetGuidRepository<Comment>();
+
+			//���Ӳ�������
+			var topicId = FreeUtil.NewMongodbId();
+			topicRepository.Insert(new Topic {
+				Id = FreeUtil.NewMongodbId(),
+				Title = "���±���1",
+				Content = "��������1",
+				CreateTime = DateTime.Now
+			});
+
+			//����10����������
+			var comments = Enumerable.Range(0, 10).Select(a => new Comment {
+				Id = FreeUtil.NewMongodbId(),
+				TopicId = topicId,
+				Nickname = $"�dz�{a}",
+				Content = $"��������{a}",
+				CreateTime = DateTime.Now
+			});
+			var affrows = commentRepository.Insert(comments);
+
+			var find = commentRepository.Select.Where(a => a.Topic.Title == "���±���1").ToList();
+
+
+
+
 			var sql = g.sqlite.CodeFirst.GetComparisonDDLStatements<TopicAddField>();
 
 			var id = g.sqlite.Insert<TopicAddField>().AppendData(new TopicAddField { }).ExecuteIdentity();
diff --git a/readme.md b/readme.md
index 73a2e243..7d137ffb 100644
--- a/readme.md
+++ b/readme.md
@@ -34,6 +34,7 @@ IFreeSql fsql = new FreeSql.FreeSqlBuilder()
 
     .UseAutoSyncStructure(true) //自动同步实体结构到数据库
     .UseSyncStructureToLower(true) //转小写同步结构
+    .UseSyncStructureToUpper(true) //转大写同步结构
 
     .UseLazyLoading(true) //延时加载导航属性对象，导航属性需要声明 virtual
     .Build();