diff --git a/samples/Sample.SqlServer/Startup.cs b/samples/Sample.SqlServer/Startup.cs
index 46030490..b253a8b6 100644
--- a/samples/Sample.SqlServer/Startup.cs
+++ b/samples/Sample.SqlServer/Startup.cs
@@ -7,13 +7,9 @@ using Microsoft.Extensions.Logging;
 using Sample.SqlServer.DbContexts;
 using Sample.SqlServer.Shardings;
 using ShardingCore;
-using System;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
-using Sample.SqlServer.Domain.Entities;
-using ShardingCore.Extensions;
 using ShardingCore.Sharding.ReadWriteConfigurations;
-using ShardingCore.Sharding.ShardingComparision;
+using System;
+using System.Collections.Generic;
 
 namespace Sample.SqlServer
 {
diff --git a/src/ShardingCore/Sharding/MergeEngines/Abstractions/AbstractBaseMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/Abstractions/AbstractBaseMergeEngine.cs
index 503abf8a..b61adf34 100644
--- a/src/ShardingCore/Sharding/MergeEngines/Abstractions/AbstractBaseMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/Abstractions/AbstractBaseMergeEngine.cs
@@ -38,6 +38,7 @@ namespace ShardingCore.Sharding.MergeEngines.Abstractions
             _semaphore = new SemaphoreSlim(Math.Max(1, streamMergeContext.GetParallelQueryMaxThreadCount()));
             _parallelQueryTimeOut = streamMergeContext.GetParallelQueryTimeOut();
         }
+
         /// <summary>
         /// 异步多线程控制并发
         /// </summary>
@@ -45,31 +46,21 @@ namespace ShardingCore.Sharding.MergeEngines.Abstractions
         /// <param name="executeAsync"></param>
         /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public Task<TResult> AsyncParallelLimitExecuteAsync<TResult>(Func<Task<TResult>> executeAsync,CancellationToken cancellationToken=new CancellationToken())
+        public async Task<TResult> AsyncParallelLimitExecuteAsync<TResult>(Func<Task<TResult>> executeAsync,CancellationToken cancellationToken=new CancellationToken())
         {
+            cancellationToken.ThrowIfCancellationRequested();
             var parallelTimeOut = _parallelQueryTimeOut.TotalMilliseconds;
-            var acquired = this._semaphore.Wait((int)parallelTimeOut);
+            var acquired = await this._semaphore.WaitAsync((int)parallelTimeOut, cancellationToken);
             if (acquired)
             {
                 var once = new SemaphoreReleaseOnlyOnce(this._semaphore);
                 try
                 {
-                    return Task.Run(async () =>
-                    {
-                        try
-                        {
-                            return await executeAsync();
-                        }
-                        finally
-                        {
-                            once.Release();
-                        }
-                    }, cancellationToken);
+                    return await executeAsync();
                 }
-                catch (Exception e)
+                finally
                 {
                     once.Release();
-                    throw e;
                 }
             }
             else
@@ -77,5 +68,10 @@ namespace ShardingCore.Sharding.MergeEngines.Abstractions
                 throw new ShardingCoreParallelQueryTimeOutException(_executeExpression.ShardingPrint());
             }
         }
+
+        public void Dispose()
+        {
+            _semaphore?.Dispose();
+        }
     }
 }
diff --git a/src/ShardingCore/Sharding/MergeEngines/Abstractions/IAsyncParallelLimit.cs b/src/ShardingCore/Sharding/MergeEngines/Abstractions/IAsyncParallelLimit.cs
index 81b91859..dd3d9ba3 100644
--- a/src/ShardingCore/Sharding/MergeEngines/Abstractions/IAsyncParallelLimit.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/Abstractions/IAsyncParallelLimit.cs
@@ -13,7 +13,7 @@ namespace ShardingCore.Sharding.MergeEngines.Abstractions
     * @Ver: 1.0
     * @Email: 326308290@qq.com
     */
-    internal interface IAsyncParallelLimit
+    internal interface IAsyncParallelLimit:IDisposable
     {
         Task<TResult> AsyncParallelLimitExecuteAsync<TResult>(Func<Task<TResult>> executeAsync,
             CancellationToken cancellationToken = new CancellationToken());