diff --git a/agent.js b/agent.js
index d89f66d..6ec7805 100644
--- a/agent.js
+++ b/agent.js
@@ -3,42 +3,41 @@
 const SCHEDULE_HANDLER = Symbol.for('egg#scheduleHandler');
 const WorkerStrategy = require('./lib/strategy/worker');
 const AllStrategy = require('./lib/strategy/all');
-const BaseStrategy = require('./lib/strategy/base');
-const Schedule = require('./lib/schedule');
 
 module.exports = agent => {
-  const handlers = agent[SCHEDULE_HANDLER] = {};
-  agent.schedule = new Schedule(agent);
-  agent.ScheduleStrategy = BaseStrategy;
+  // register built-in strategy
+  agent.schedule.use('worker', WorkerStrategy);
+  agent.schedule.use('all', AllStrategy);
 
-  agent.beforeClose(() => {
-    return agent.schedule.close();
+  // TODO: compatible, will remove at next major
+  const handlers = {};
+  Object.defineProperty(agent, SCHEDULE_HANDLER, {
+    get() {
+      agent.deprecate('should use `agent.schedule.use()` instead of `agent[Symbol.for(\'egg#scheduleHandler\')]` to register handler.');
+      return handlers;
+    },
   });
 
   agent.messenger.once('egg-ready', () => {
-    agent.schedule.use('worker', WorkerStrategy);
-    agent.schedule.use('all', AllStrategy);
-    //TODO: compatible, will remove at next major
     const keys = Object.keys(handlers);
-    if (keys.length) agent.deprecate('should use `schedule.use()` instead of `agent[Symbol.for(\'egg#scheduleHandler\')]` to register handler.');
     for (const type of keys) {
       agent.schedule.use(type, handler2Class(type, handlers[type]));
     }
+    // start schedule
     agent.schedule.start();
   });
 
   function handler2Class(type, fn) {
-    return class CustomStrategy extends BaseStrategy {
-      constructor(...args) {
-        super(...args);
-        this.type = type;
-      }
+    return class CustomStrategy extends agent.ScheduleStrategy {
       start() {
         fn(this.schedule, {
           one: this.sendOne.bind(this),
           all: this.sendAll.bind(this),
         });
       }
+      close() {
+        this.agent.logger.warn(`schedule type [${type}] stop is not implemented yet`);
+      }
     };
   }
 };
diff --git a/app.js b/app.js
index 5468a91..d9c1cd6 100644
--- a/app.js
+++ b/app.js
@@ -51,17 +51,17 @@ module.exports = app => {
 
       const start = Date.now();
       task(ctx)
-      .then(() => true) // succeed
-      .catch(err => {
-        err.message = `[egg-schedule] ${key} excute error. ${err.message}`;
-        app.logger.error(err);
-        return false;   // failed
-      })
-      .then(success => {
-        const rt = Date.now() - start;
-        const status = success ? 'succeed' : 'failed';
-        app.coreLogger.info(`[egg-schedule] ${key} excute ${status}, used ${rt}ms`);
-      });
+        .then(() => true) // succeed
+        .catch(err => {
+          err.message = `[egg-schedule] ${key} excute error. ${err.message}`;
+          app.logger.error(err);
+          return false; // failed
+        })
+        .then(success => {
+          const rt = Date.now() - start;
+          const status = success ? 'succeed' : 'failed';
+          app.coreLogger.info(`[egg-schedule] ${key} excute ${status}, used ${rt}ms`);
+        });
     });
   }
 };
diff --git a/app/extend/agent.js b/app/extend/agent.js
new file mode 100644
index 0000000..9b3f956
--- /dev/null
+++ b/app/extend/agent.js
@@ -0,0 +1,25 @@
+'use strict';
+
+const Strategy = require('../../lib/strategy/base');
+const Schedule = require('../../lib/schedule');
+const SCHEDULE = Symbol('agent#schedule');
+
+module.exports = {
+  /**
+   * @member agent#ScheduleStrategy
+   */
+  ScheduleStrategy: Strategy,
+
+  /**
+   * @member agent#schedule
+   */
+  get schedule() {
+    if (!this[SCHEDULE]) {
+      this[SCHEDULE] = new Schedule(this);
+      this.beforeClose(() => {
+        return this[SCHEDULE].close();
+      });
+    }
+    return this[SCHEDULE];
+  },
+};
diff --git a/lib/schedule.js b/lib/schedule.js
index 53821a3..0e4509a 100644
--- a/lib/schedule.js
+++ b/lib/schedule.js
@@ -10,11 +10,11 @@ module.exports = class Schedule {
     this.agent = agent;
     this[STRATEGY] = new Map();
     this[HANDLER] = new Map();
+    this.closed = false;
   }
 
   use(type, clz) {
-    assert(typeof clz.prototype.start === 'function', `schedule type [${type}] should implement \`start\` method`)
-    clz.prototype.type = type;
+    assert(typeof clz.prototype.start === 'function', `schedule type [${type}] should implement \`start\` method`);
     this[STRATEGY].set(type, clz);
   }
 
@@ -42,9 +42,9 @@ module.exports = class Schedule {
 
   close() {
     this.closed = true;
-    for (const handler of this[HANDLER].values()) {
+    for (const [ key, handler ] of this[HANDLER].entries()) {
+      this.agent.coreLogger.info(`[egg-schedule] close tasks: ${key}`);
       handler.close();
     }
-    this.agent.coreLogger.info('[egg-schedule] close tasks.');
   }
 };
diff --git a/lib/strategy/base.js b/lib/strategy/base.js
index 370c5f0..4960f39 100644
--- a/lib/strategy/base.js
+++ b/lib/strategy/base.js
@@ -26,10 +26,4 @@ module.exports = class BaseStrategy {
     this.agent.coreLogger.info(`[egg-schedule] send message to all worker: ${this.key}`);
     this.agent.messenger.send(this.key);
   }
-
-  /* istanbul ignore next */
-  close() {
-    /* istanbul ignore next */
-    this.agent.logger.warn(`schedule type [${this.type}] stop is not implemented yet`);
-  }
 };
diff --git a/lib/timer.js b/lib/timer.js
index db3b472..1fdd242 100644
--- a/lib/timer.js
+++ b/lib/timer.js
@@ -79,4 +79,4 @@ class Timer {
   }
 }
 
-module.exports = Timer;
\ No newline at end of file
+module.exports = Timer;
diff --git a/test/schedule.test.js b/test/schedule.test.js
index 41ec57d..b475087 100644
--- a/test/schedule.test.js
+++ b/test/schedule.test.js
@@ -90,7 +90,6 @@ describe('test/schedule.test.js', () => {
       yield app.ready();
       yield sleep(5000);
       const log = getLogContent('customType');
-      const errorLog = getErrorLogContent('customType');
       // console.log(log);
       assert(contains(log, 'custom_log') === 1);
       assert(contains(log, 'cluster_log') === 1);