美國F1 學生visa簽証

As soon as you have a valid I-20 with you, you will be allowed to enter.

However - a friendly reminder - if your study won't be finish in July and you won't be return to Hong Kong in July or before, it is best to renew your visa when you return.

Expired F-1 visa is considered as out of status.

http://chinese.hongkong.usconsulate.gov/niv_study.html#4



如果我是持有學生/交流訪客簽證的返校生，在我離美渡假後，再次入美返校時需要什麽證件？

再次入美返校的學生/交流訪客必須在入美國境內時出示有效護照，有效學生/交流訪客簽證，和正確簽註有效的I-20/DS-2019。有效學生/交流訪客簽證是可以蓋在一本舊的或己過期的護照上。