Q.我的护照已经到期，但是其中的美国签证仍然有效。我是否需要申请新的签证？

不需要，如果您的签证仍然有效，则您可以使用新旧两本护照到美国旅行，前提是签证未损坏，且旅行主要目的与签证类型相符 （例如： 如果主要旅行目的为旅游，则签证必须为旅游签证）。另外，两本护照上的姓名与其他个人信息必须一致，且两本护照必须是同一国家签发的同一类型护照（即均为旅游护照或外交护照）。

Q.8 My passport has expired, but the U.S. visa in it is still valid. Do I need to apply for a new visa?

No. If your visa is still valid you can travel to the United States with your two passports (old and new), as long as the visa is valid, not damaged, and is the appropriate type of visa required for your principal purpose of travel. (Example: tourist visa, when your principal purpose of travel is tourism). Also, the name and other personal data must be the same in both passports, and both passports must be from the same country and of the same type (i.e., both tourist passports or both diplomatic passports).

来源：2017-04-12美国驻华大使馆美国驻华大使馆