Starting November 29, 2016, all individuals carrying maximum validity (10-year) B1/B2, B1, and B2 visas in passports issued by the People’s Republic of China must have a valid EVUS (Electronic Visa Update System) enrollment in order to travel to the United States. Travelers who are subject to EVUS requirements but do not have valid enrollments will not be able to obtain a boarding pass or enter through a land port of entry.
EVUS is the online system used by nationals of China holding a 10-year B1/B2, B1 or B2 (visitor) visa periodically to update basic biographic information to facilitate their travel to the United States. In addition to a valid visa, such travelers will be required to complete an EVUS enrollment to be admitted into the United States.
EVUS FAQs are available here.