diff --git a/lib/Lib/Driver/Session/DbSession.js b/lib/Lib/Driver/Session/DbSession.js
index 62b83a70..d9296b89 100644
--- a/lib/Lib/Driver/Session/DbSession.js
+++ b/lib/Lib/Driver/Session/DbSession.js
@@ -5,11 +5,11 @@
  *  DROP TABLE IF EXISTS `think_session`;
   CREATE TABLE `think_session` (
     `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
-    `key` varchar(255) NOT NULL DEFAULT '',
+    `cookie` varchar(255) NOT NULL DEFAULT '',
     `data` text,
     `expire` bigint(11) NOT NULL,
     PRIMARY KEY (`id`),
-    UNIQUE KEY `cookie` (`key`),
+    UNIQUE KEY `cookie` (`cookie`),
     KEY `expire` (`expire`)
   ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  *
@@ -36,7 +36,7 @@ module.exports = Cache(function(){
      */
     init: function(options){
       this.super_('init', options);
-      this.key = this.options.cookie;
+      this.cookie = this.options.cookie;
       this.data = {};
       this.isChanged = false;
       if (!model) {
@@ -51,10 +51,10 @@ module.exports = Cache(function(){
     initData: function(){
       if (!this.promise) {
         var self = this;
-        this.promise = model.where({key: this.key}).find().then(function(data){
+        this.promise = model.where({cookie: this.cookie}).find().then(function(data){
           if (isEmpty(data)) {
             return model.add({
-              key: self.key,
+              cookie: self.cookie,
               expire: Date.now() + self.options.timeout * 1000
             });
           }
@@ -119,7 +119,7 @@ module.exports = Cache(function(){
         if (self.isChanged) {
           data.data = JSON.stringify(self.data);
         }
-        return model.where({key: self.key}).update(data);
+        return model.where({cookie: self.cookie}).update(data);
       });
     },
     /**
diff --git a/test/Lib/Driver/Session/DbSession.js b/test/Lib/Driver/Session/DbSession.js
index 44195e8f..4edbf7af 100644
--- a/test/Lib/Driver/Session/DbSession.js
+++ b/test/Lib/Driver/Session/DbSession.js
@@ -23,16 +23,16 @@ describe('before', function(){
       if (sql === 'SHOW COLUMNS FROM `think_session`') {
         return getPromise([ 
           { Field: 'id',Type: 'int(11) unsigned',Null: 'NO',Key: 'PRI',Default: null,Extra: 'auto_increment' },
-          { Field: 'key',Type: 'varchar(255)',Null: 'NO',Key: 'UNI',Default: '',Extra: '' },
+          { Field: 'cookie',Type: 'varchar(255)',Null: 'NO',Key: 'UNI',Default: '',Extra: '' },
           { Field: 'data',Type: 'text',Null: 'YES',Key: '',Default: null,Extra: '' },
           { Field: 'expire',Type: 'bigint(11)',Null: 'NO',Key: 'MUL',Default: null,Extra: '' } 
         ]);
-      }else if (sql === "SELECT * FROM `think_session` WHERE ( `key` = 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_' ) LIMIT 1") {
-        return getPromise([ { id: 1,key: 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_',data: '{"name":"suredy"}',expire: 1509896404697 } ])
-      }else if (sql === "SELECT * FROM `think_session` WHERE ( `key` = 'expired' ) LIMIT 1") {
-        return getPromise([ { id: 1,key: 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_',data: '{"name":"suredy"}',expire: 1309896404697 } ])
-      }else if (sql === "SELECT * FROM `think_session` WHERE ( `key` = 'dataempty' ) LIMIT 1") {
-        return getPromise([ { id: 1,key: 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_',data: '',expire: 1409896404697 } ])
+      }else if (sql === "SELECT * FROM `think_session` WHERE ( `cookie` = 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_' ) LIMIT 1") {
+        return getPromise([ { id: 1,cookie: 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_',data: '{"name":"suredy"}',expire: 1509896404697 } ])
+      }else if (sql === "SELECT * FROM `think_session` WHERE ( `cookie` = 'expired' ) LIMIT 1") {
+        return getPromise([ { id: 1,cookie: 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_',data: '{"name":"suredy"}',expire: 1309896404697 } ])
+      }else if (sql === "SELECT * FROM `think_session` WHERE ( `cookie` = 'dataempty' ) LIMIT 1") {
+        return getPromise([ { id: 1,cookie: 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_',data: '',expire: 1409896404697 } ])
       }
       return getPromise([]);
     })
@@ -42,12 +42,12 @@ describe('before', function(){
 describe('DbSession', function(){
   it('init', function(){
     var instance = DbSession();
-    assert.equal(instance.key, undefined);
+    assert.equal(instance.cookie, undefined);
     assert.equal(instance.isChanged, false)
   })
   it('init with cookie', function(){
     var instance = DbSession({cookie: 'welefen'});
-    assert.equal(instance.key, 'welefen');
+    assert.equal(instance.cookie, 'welefen');
     assert.equal(instance.isChanged, false)
   })
   it('initData', function(done){
@@ -148,7 +148,7 @@ describe('DbSession', function(){
     }
     instance.flush().then(function(data){
       var sql = instance.model.getLastSql().trim();
-      assert.equal(sql, "UPDATE `think_session` SET `expire`=1409859026812 WHERE ( `key` = 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_' )")
+      assert.equal(sql, "UPDATE `think_session` SET `expire`=1409859026812 WHERE ( `cookie` = 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_' )")
       Date.now = now;
       done();
     })
@@ -162,7 +162,7 @@ describe('DbSession', function(){
     instance.isChanged = true;
     instance.flush().then(function(data){
       var sql = instance.model.getLastSql().trim();
-      var s = "UPDATE `think_session` SET `expire`=1409880626812,`data`='{\\\"name\\\":\\\"suredy\\\"}' WHERE ( `key` = 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_' )";
+      var s = "UPDATE `think_session` SET `expire`=1409880626812,`data`='{\\\"name\\\":\\\"suredy\\\"}' WHERE ( `cookie` = 'Nru4DV9uYy3jUP8_MDl4l-wbkVe-gQO_' )";
       assert.equal(sql, s)
       Date.now = now;
       done();