回复：you need to bring your H1/H4 documents to US consulate in Chi

Thank you so much for detailed explanation. We once entered U.S. from Canada using H1/H4 approval notice, and on our passports, I found a stamp with handwritten "Class H1/H4 until Sept. 2009", respectively. Is that the visa stamp you mentioned? If it is, do I still need to go to U.S. consulate in China before coming back? Thank you a lot!