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1）父母要来美国，已经enrolled EVUS,才发现护照3月到期。在国内已经办了新护照。美国签证在旧护照上。两本护照可以一起用吗？

-Yes. Show both passport to the Chinese Customs Officer when departing China and to the US CBP Officer when entering US.

２）如何在EVUS上update 新护照的信息？ 上了ＥＶＵＳ的网。ｕｐｄａｔｅ的页面没有让更新护照的地方。是不是不用ｕｐｄａｔｅ新护照的信息啊？（美国签证在旧护照上）

还是要重新enroll EVUS？

-I think so. Read this at: https://www.cbp.gov/travel/international-visitors/electronic-visa-update-system-evus/frequently-asked-questions

My passport has expired. Do I need to enroll in EVUS as soon as I get a new passport or can I do that before my next trip?

If you have a new passport, you will need to enroll in EVUS before your next trip to the United States. We recommend you enroll at least one week before you are scheduled to leave for the United States.

重新enroll 会和已经enrolled EVUS 有冲突吗？

-I don't think so.