How to keep green card, if back to China?

來源: 於 2009-06-21 14:57:38 [舊帖] [給我悄悄話] 本文已被閱讀：次

I have green card. However, It is hard to find a job in US. I decide back to China to find a job. I still want to keep green card. should I come back to U.S after 6 month?