anyhow, thank you!
I already install the extensions on my USB disk.
step1: run the iso file in VM, download the extentions (prel5.tcz, syslinux.tcz, dosfstools-3.tcz) by share the host IP
step2: insert the usb disk and run "usb install" in cpanel to make a bootble usb hdd
step3: continu to download other extentions as I want.
step4: copy or move these extentions from /tmp/tce/optional/ to /mnt/sdb1/tce/optional/
step5: reboot the computer by usb stick, after TCL done, run "Apps Audit" in cpanel to set which extention(s) need to load while TCL is booting.
step6: reboot computer, extentions load by themselvs.
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But now, how to change the wbar such as add a own extention's icon, any sugustions?