I burned a boot USBkey with the command(from CentOS wiki):
dd if=CentOS-6.5-x86_64-bin-DVD1.iso of=/dev/sdb
After the command, I found my USBkey has beened wipe all partitions and it showed entirely freespace of my USB. However, I could find the USB-booting option in my computer's BIOS after rebooting and it shows the installation UI, and thus I think it will work on server too.
So I reboot my server
lenovo x3650m5(PS: I have found that RHEL6 support the server, so
CentOS is supposed to support it), but it failed-it found the USB, but it couldn't load the booting system.
Did I miss anything needed for the boot operation on the server?