use SSISUpgrade.exe from command line
​​​ http://www.sql-server-performance.com/2010/upgarde-2005-packages-2008-i/​​

SSISUpgrade.exe 的默认路径是：C:Program Files\Microsoft SQL Server\100\DTS\Binn

You can launch SSIS Package Upgrade Wizard from command prompt by typing SSISUpgrade.exe (default physical location C:Program FilesMicrosoft SQL Server100DTSBinn folder). Alternatively, if you open a SSIS 2005 project in BIDS 2008, it will automatically launch the SSIS package upgrade wizard.

如果用VS2008 打开 sql 2005版本的ssis package, 它会自动跳出一个向导一步步提示你升级。 这种 通过BIDS的方式 ，很可能会因为package中包含 task components 而升级不成功。