Thanks for your suggestion, Daemonforce. I have figured out the issue caused by the ISO editor. the iso file on RIS server may not be modified once it created. I just spend 3 hours to create a new one with all the new stuff and works fine. Sure, the ramdisk is the matter but I need it to dynamicly create script file for diskpart or other utilities. The WinPE 2 with WDS is great, tested for a week, but there is no way to find all the NIC drivers for my systems. I have to wait it until final release. Anyway, thanks a lot Daemonforce.