Thanks for replying.
No, I didn't use USB, only password. And I think there are actually bugs in the password system:
I tried install the OS again in another partition. Then I installed the CDE again, tried set the password for the setting area. When I try to go setting again, password doesn't work. I was pretty sure the password I typed in.
In addition, I tried to mount the encrypted partition in the newly installed windows. After I installed the CDE and reboot, then opened CDE, it prompted me said "there are some changes to your file system, please restart windows". If I restart, will back into the trap of "enter the password". I've also tried decrypting the partition by using "Add Encrypted Partition". It won't mount the partition neither. Now, even I have a CDE there still not able to decrypt.