那麽我老婆進入美國以後，如果按照您說的她以前的H4 I797身份紙失效了話，我還要給她申請一張新的h4 I797的身份紙嗎？我需要做什麽嗎？
-Nothing needed to do.
另外，現在有一個公司正在給我辦H1B transfer，準備倆周後去新公司上班。先辦完我的h1b transfer，等我的H1B approval下來以後需要再給她辦H4嗎？
-Your wife just needs to show your H1 approval notice to the CBP officer and she will be issued a new I-94 with the same length as your H1 duration. The H4 visa and the new I-94 is her H4 status evidence/document. Her old H4 approval notice is useless. She does not have to to extend her H4 status with you at this time. She can extend her H4 status any time before her new I-94 expires (which will be in 2012). Just remind your wife to check the I-94 duration to see whether it matches your H1 duration at the port of entry after the officer issues it to your wife. if it does not match your h1, ask the officer to correct it.
