diff --git a/src/Component/Cache.php b/src/Component/Cache.php
index af3e36b..294b626 100644
--- a/src/Component/Cache.php
+++ b/src/Component/Cache.php
@@ -8,6 +8,8 @@
 
 /**
  * 默认缓存组件，使用内存来做缓存
+ * 注意，这个缓存组件不太可靠，最好使用redis等KV数据库来实现缓存
+ * 缓存回收使用LRU算法
  *
  * @package tourze\Base\Component
  */
@@ -19,11 +21,26 @@ class Cache extends Component implements CacheInterface
      */
     protected $_cache = [];
 
+    /**
+     * @var int[] 缓存命中记录器
+     */
+    protected $_cacheHit = [];
+
     /**
      * @var int 默认过期时间
      */
     public $expired;
 
+    /**
+     * @var int 超过这个数目，就会自动缩减缓存数据
+     */
+    public $maxLine = 20000;
+
+    /**
+     * @var int 最大超时时间
+     */
+    public $maxExpire = 3600;
+
     /**
      * {@inheritdoc}
      */
@@ -45,7 +62,7 @@ public function get($name, $default = null)
 
         $data = Arr::get($this->_cache, $name);
 
-        // 判断过期时间
+        // 判断过期时间，过期的话，直接删除
         $current = time();
         $expired = Arr::get($data, 'expired');
         if ($current > $expired)
@@ -60,6 +77,7 @@ public function get($name, $default = null)
         }
 
         $value = Arr::get($data, 'value');
+        $this->saveHitTime($name);
         return $value;
     }
 
@@ -68,7 +86,13 @@ public function get($name, $default = null)
      */
     public function set($name, $value, $expired = null)
     {
+        $this->checkSize();
+
         // 过期时间自动加上当前时间戳
+        if ($expired > $this->maxExpire)
+        {
+            $expired = $this->maxExpire;
+        }
         $expired = time() + $expired;
 
         Base::getLog()->debug(__METHOD__ . ' save cache', [
@@ -80,9 +104,62 @@ public function set($name, $value, $expired = null)
             'value'   => $value,
             'expired' => $expired,
         ];
+        $this->_cacheHit[$name] = time();
+
+        $this->checkSize();
         return true;
     }
 
+    /**
+     * 保存最新命中时间
+     *
+     * @param string $name
+     */
+    private function saveHitTime($name)
+    {
+        $this->_cacheHit[$name] = time();
+    }
+
+    /**
+     * 检查内存中的缓存尺寸
+     */
+    private function checkSize()
+    {
+        // 到达缓存记录数的警戒线啦
+        if (count($this->_cache) >= $this->maxLine)
+        {
+            asort($this->_cacheHit);
+            $longestTime = current($this->_cacheHit);
+            reset($this->_cacheHit);
+
+            /*
+            if (($longestTime + $this->maxExpire) < time())
+            {
+                $subTime = time() - $this->maxExpire;
+                foreach ($this->_cacheHit as $key => $cacheTime)
+                {
+                    if ($cacheTime)
+                }
+            }
+            else
+            {
+
+            }
+            */
+
+            $cutLength = intval($this->maxLine / 10);
+            foreach ($this->_cacheHit as $key => $cacheTime)
+            {
+                if ($cutLength <= 0)
+                {
+                    break;
+                }
+                $this->remove($key);
+                $cutLength--;
+            }
+        }
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -92,6 +169,7 @@ public function remove($name)
             'name' => $name,
         ]);
         unset($this->_cache[$name]);
+        unset($this->_cacheHit[$name]);
         return true;
     }
 }