diff --git a/src/admin/Bootstrap.Admin/Controllers/Api/TasksController.cs b/src/admin/Bootstrap.Admin/Controllers/Api/TasksController.cs
index 608c2e46..8ba81bed 100644
--- a/src/admin/Bootstrap.Admin/Controllers/Api/TasksController.cs
+++ b/src/admin/Bootstrap.Admin/Controllers/Api/TasksController.cs
@@ -3,6 +3,7 @@ using Longbow;
 using Longbow.Tasks;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -55,8 +56,6 @@ namespace Bootstrap.Admin.Controllers.Api
         {
             // 判断 Cron 表达式
             if (string.IsNullOrEmpty(widget.CronExpression)) return false;
-            // 判断 任务是否已经存在
-            if (TaskServicesManager.Get(widget.Name) != null) return false;
 
             // 加载任务执行体
             // 此处可以扩展为任意 DLL 中的任意继承 ITask 接口的实体类
@@ -64,9 +63,35 @@ namespace Bootstrap.Admin.Controllers.Api
             if (taskExecutor == null) return false;
 
             // 此处未存储到数据库中，直接送入任务中心
+            TaskServicesManager.Remove(widget.Name);
             var expression = Longbow.Tasks.Cron.ParseCronExpression(widget.CronExpression);
             TaskServicesManager.GetOrAdd(widget.Name, token => taskExecutor.Execute(token), TriggerBuilder.Build(widget.CronExpression));
             return true;
         }
+
+        private static IEnumerable<string> _tasks = new string[] {
+            "单次任务",
+            "周期任务",
+            "Cron 任务",
+            "超时任务",
+            "取消任务",
+            "禁用任务",
+            "SQL日志"
+        };
+        /// <summary>
+        /// 删除任务方法
+        /// </summary>
+        /// <param name="ids"></param>
+        /// <returns></returns>
+        [HttpDelete]
+        public bool Delete([FromBody]IEnumerable<string> ids)
+        {
+            // 演示模式下禁止删除内置任务
+            if (DictHelper.RetrieveSystemModel() && _tasks.Any(t => ids.Any(id => id.Equals(t, StringComparison.OrdinalIgnoreCase)))) return false;
+
+            // 循环删除任务
+            ids.ToList().ForEach(id => TaskServicesManager.Remove(id));
+            return true;
+        }
     }
 }
diff --git a/src/admin/Bootstrap.Admin/Models/TaskModel.cs b/src/admin/Bootstrap.Admin/Models/TaskModel.cs
index 148417a1..ef362b62 100644
--- a/src/admin/Bootstrap.Admin/Models/TaskModel.cs
+++ b/src/admin/Bootstrap.Admin/Models/TaskModel.cs
@@ -16,15 +16,27 @@ namespace Bootstrap.Admin.Models
         {
             // 此处为演示代码，具体生产环境可以从数据库配置获得
             // Key 为任务名称 Value 为任务执行体 FullName
-            Tasks = new Dictionary<string, string>
+            TaskExecutors = new Dictionary<string, string>
             {
-                {"测试任务", "Bootstrap.Admin.DefaultTaskExecutor"}
+                { "测试任务", "Bootstrap.Admin.DefaultTaskExecutor" }
+            };
+
+            TaskTriggers = new Dictionary<string, string>
+            {
+                { "每 5 秒钟执行一次", Longbow.Tasks.Cron.Secondly(5) },
+                { "每 1 分钟执行一次", Longbow.Tasks.Cron.Minutely(1) }
             };
         }
 
         /// <summary>
         /// 获得 系统内置的所有任务
         /// </summary>
-        public IDictionary<string, string> Tasks { get; }
+        public IDictionary<string, string> TaskExecutors { get; }
+
+        /// <summary>
+        /// 获得 系统内置触发器集合
+        /// </summary>
+        /// <value></value>
+        public IDictionary<string, string> TaskTriggers { get; }
     }
 }
diff --git a/src/admin/Bootstrap.Admin/Views/Admin/Tasks.cshtml b/src/admin/Bootstrap.Admin/Views/Admin/Tasks.cshtml
index f63d2a67..7dfc35c8 100644
--- a/src/admin/Bootstrap.Admin/Views/Admin/Tasks.cshtml
+++ b/src/admin/Bootstrap.Admin/Views/Admin/Tasks.cshtml
@@ -22,6 +22,9 @@
         <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
     </div>
     <div class="modal-body">
+        <div class="alert alert-danger" role="alert" asp-condition="@Model.IsDemo">
+            <span>演示系统禁止修改内置后台任务</span>
+        </div>
         <form class="form-inline">
             <div class="row">
                 <div class="form-group col-12">
@@ -30,13 +33,19 @@
                 </div>
                 <div class="form-group col-12">
                     <label class="control-label" for="taskCron">Cron表达式</label>
-                    <input type="text" class="form-control flex-sm-fill" id="taskCron" placeholder="不可为空，2000字以内" maxlength="2000" data-valid="true" />
+                    <input class="form-control" data-toggle="lgbSelect" />
+                    <select data-toggle="lgbSelect" class="d-none" id="taskCron" data-default-val="*/5 * * * * *">
+                        @foreach (var task in Model.TaskTriggers)
+                        {
+                            <option value="@task.Value">@task.Key</option>
+                        }
+                    </select>
                 </div>
                 <div class="form-group col-12">
                     <label class="control-label" for="taskContent">内置任务</label>
-                    <input class="form-control" data-toggle="lgbSelect" data-default-val="Bootstrap.Admin.DefaultTaskExecutor" />
-                    <select data-toggle="lgbSelect" class="d-none" id="taskExecutor">
-                        @foreach (var task in Model.Tasks)
+                    <input class="form-control" data-toggle="lgbSelect" />
+                    <select data-toggle="lgbSelect" class="d-none" id="taskExecutor" data-default-val="Bootstrap.Admin.DefaultTaskExecutor">
+                        @foreach (var task in Model.TaskExecutors)
                         {
                             <option value="@task.Value">@task.Key</option>
                         }
diff --git a/src/admin/Bootstrap.Admin/wwwroot/js/tasks.js b/src/admin/Bootstrap.Admin/wwwroot/js/tasks.js
index d6ef5e77..024bbc94 100644
--- a/src/admin/Bootstrap.Admin/wwwroot/js/tasks.js
+++ b/src/admin/Bootstrap.Admin/wwwroot/js/tasks.js
@@ -43,6 +43,7 @@
             }
         },
         smartTable: {
+            idField: 'Name',
             sidePagination: "client",
             sortName: 'Name',
             sortOrder: 'asc',