回复：询问：在北京返签，需要身份证吗？

不知进美国大使馆是否需要身份证？No.

But, when you 在北京返签，you can't get the passport back right away. If you let the embassy mail it back to you, I guess you don't need 身份证. If you go back to the embassy to pick it up yourself, you have to show 身份证 in order to get the passport back.