diff --git a/install.php b/install.php
index eedb92ca..ac1179a9 100644
--- a/install.php
+++ b/install.php
@@ -471,12 +471,14 @@ list($prefixVersion, $suffixVersion) = explode('/', $currentVersion);
                                         $key = '{' . $key . '}';
                                     }
 
+                                    if (!empty($_dbConfig['dbDsn'])) {
+                                        $dbConfig['dsn'] = str_replace($replace, array_values($dbConfig), $dbConfig['dsn']);
+                                    }
                                     $config = str_replace($replace, array_values($dbConfig), _r('config'));
-                                    $dbConfig['dsn'] = str_replace($replace, array_values($dbConfig), $dbConfig['dsn']);
                                 }
 
                                 if (!isset($config) && $success && !_r('created')) {
-                                    $installDb = new Typecho_Db ($adapter, _r('dbPrefix'));
+                                    $installDb = new Typecho_Db($adapter, _r('dbPrefix'));
                                     $installDb->addServer($dbConfig, Typecho_Db::READ | Typecho_Db::WRITE);
 
 
diff --git a/install/Mysql.php b/install/Mysql.php
index a3c9bc84..dac68993 100644
--- a/install/Mysql.php
+++ b/install/Mysql.php
@@ -103,13 +103,13 @@ $baeDbPassword = "getenv('HTTP_BAE_ENV_SK')";
     <li>
         <label class="typecho-label" for="dbHost"><?php _e('数据库实例名'); ?></label>
         <input type="text" class="text" name="dbHost" id="dbHost" value="<?php _v('dbHost'); ?>"/>
-        <p class="description"><?php _e('请填入您在Cloud SQL面板中创建的数据库实例名称，示例：<em class="warning">/cloudsql/typecho-gae:typecho</em>'); ?></p>
+        <p class="description"><?php _e('请填入您在Cloud SQL面板中创建的数据库实例名称, 示例: %s', '<em class="warning">/cloudsql/typecho-gae:typecho</em>'); ?></p>
     </li>
 <?php else: ?>
     <li>
         <label class="typecho-label" for="dbHost"><?php _e('数据库实例名'); ?></label>
         <input type="text" class="text" name="dbHost" id="dbHost" value="<?php _v('dbHost'); ?>"/>
-        <p class="description"><?php _e('请填入您在Cloud SQL面板中创建的数据库实例名称，示例：<em class="warning">:/cloudsql/typecho-gae:typecho</em>'); ?></p>
+        <p class="description"><?php _e('请填入您在Cloud SQL面板中创建的数据库实例名称, 示例: %s', '<em class="warning">:/cloudsql/typecho-gae:typecho</em>'); ?></p>
     </li>
 <?php endif; ?>
 
@@ -130,7 +130,7 @@ $baeDbPassword = "getenv('HTTP_BAE_ENV_SK')";
 <?php if (0 === strpos($adapter, 'Pdo_')): ?>
     <input type="hidden" name="dbDsn" value="mysql:dbname={database};unix_socket={host};charset=<?php _e('utf8'); ?>" />
     <input type="hidden" name="config" value="array (
-    'dsn'       =>  'mysql:dbname={database};unix_socket={host};charset=<?php _e('utf8'); ?>',
+    'dsn'       =>  '{dsn}',
     'user'      =>  '{user}',
     'password'  =>  '{password}'
 )" />