Thanks for replying my earlier question for travling. Just found one problem... My birth certificate is correct, but my canadian passport put one more character in the birth city than my birth certificate document which is spelling error. I will change my passport once come back from china, and will correct the error in new passport. just wondering whether it will affect my 485 filing. Since it needs at least 3 months to get new passport, I want to file 584 first. Any expert knows whether it is doable? thanks for help.