diff --git a/samples/EasyCron.Sample/Controllers/WeatherForecastController.cs b/samples/EasyCron.Sample/Controllers/WeatherForecastController.cs
index 49d0211..59feebb 100644
--- a/samples/EasyCron.Sample/Controllers/WeatherForecastController.cs
+++ b/samples/EasyCron.Sample/Controllers/WeatherForecastController.cs
@@ -3,7 +3,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Threading.Tasks;
 
 namespace EasyCron.Sample.Controllers
 {
diff --git a/samples/EasyCron.Sample/Startup.cs b/samples/EasyCron.Sample/Startup.cs
index 032363b..781b6c2 100644
--- a/samples/EasyCron.Sample/Startup.cs
+++ b/samples/EasyCron.Sample/Startup.cs
@@ -1,19 +1,12 @@
 using EasyCron.Sample.Jobs;
-using EasyCronJob.AutoConfigurer;
 using EasyCronJob.Core;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
-using Microsoft.AspNetCore.HttpsPolicy;
-using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Logging;
 using Microsoft.OpenApi.Models;
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace EasyCron.Sample
 {
diff --git a/src/EasyCronJob.AutoConfigurer/Startup.cs b/src/EasyCronJob.AutoConfigurer/Startup.cs
index 00aec12..f281ed9 100644
--- a/src/EasyCronJob.AutoConfigurer/Startup.cs
+++ b/src/EasyCronJob.AutoConfigurer/Startup.cs
@@ -7,8 +7,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace EasyCronJob.AutoConfigurer
 {
diff --git a/src/EasyCronJob.Core/Startup.cs b/src/EasyCronJob.Core/Startup.cs
index 5e1df29..de08b6b 100644
--- a/src/EasyCronJob.Core/Startup.cs
+++ b/src/EasyCronJob.Core/Startup.cs
@@ -1,10 +1,6 @@
 using EasyCronJob.Abstractions;
 using Microsoft.Extensions.DependencyInjection;
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace EasyCronJob.Core
 {