diff --git a/module/install/lang/en.php b/module/install/lang/en.php
index 48dc64e705..7adb1c502b 100644
--- a/module/install/lang/en.php
+++ b/module/install/lang/en.php
@@ -84,7 +84,7 @@ $lang->install->requestTypes['PATH_INFO'] = 'PATH_INFO';
 
 $lang->install->errorConnectDB      = 'Database connect failed.';
 $lang->install->errorCreateDB       = 'Database create failed.';
-$lang->install->errorDBExists       = 'Database alread exists, to continue install, check the clear db box.';
+$lang->install->errorTableExists    = 'The same tables alread exists, to continue install, go back and check the clear db box.';
 $lang->install->errorCreateTable    = 'Table create failed.';
 $lang->install->errorImportDemoData = 'Import demo data.';
 
diff --git a/module/install/lang/zh-cn.php b/module/install/lang/zh-cn.php
index 2b6c36f72e..7990f48424 100644
--- a/module/install/lang/zh-cn.php
+++ b/module/install/lang/zh-cn.php
@@ -84,7 +84,7 @@ $lang->install->requestTypes['PATH_INFO'] = '静态友好方式';
 
 $lang->install->errorConnectDB      = '数据库连接失败 ';
 $lang->install->errorCreateDB       = '数据库创建失败';
-$lang->install->errorDBExists       = '数据库已经存在，继续安装请选择清空数据';
+$lang->install->errorTableExists    = '数据表已经存在，您之前应该有安装过禅道，继续安装请返回前页并选择清空数据';
 $lang->install->errorCreateTable    = '创建表失败';
 $lang->install->errorImportDemoData = '导入demo数据失败';
 
diff --git a/module/install/model.php b/module/install/model.php
index 3310c59041..377412593a 100644
--- a/module/install/model.php
+++ b/module/install/model.php
@@ -212,10 +212,10 @@ class installModel extends model
                 return $return;
             }
         }
-        elseif($this->post->clearDB == false)
+        elseif($this->tableExits() and $this->post->clearDB == false)
         {
             $return->result = 'fail';
-            $return->error  = $this->lang->install->errorDBExists;
+            $return->error  = $this->lang->install->errorTableExists;
             return $return;
         }
 
@@ -282,6 +282,19 @@ class installModel extends model
         return $this->dbh->query($sql)->fetch();
     }
 
+    /**
+     * Check table exits or not.
+     * 
+     * @access public
+     * @return void
+     */
+    public function tableExits()
+    {
+        $configTable = str_replace('`', "'", TABLE_CONFIG);
+        $sql = "SHOW TABLES FROM {$this->config->db->name} like $configTable";
+        return $this->dbh->query($sql)->fetch();
+    }
+
     /**
      * Get mysql version.
      *