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8老師你好，我由於換雇主，重新向USCIS申請了H1B簽證，也重新申請了老婆的H4簽證。如果我收到USCIS的H1B receipt number後，我老婆能離開美國嗎，會造成她H4失效嗎？
-No, but H-4 extension application is useless no matter it is denied or approved because she has to apply for the H-4 visa in China to come back, anyway. You need to send her the copy of your H-1 approval notice for her to apply for the H-4 visa in China after your H-1 transfer is approved. She cannot come back before your H-1 is approved.

You have wasted money to extend your H-4 status if she will leave US for China before her current H-4 I-94 expires.