回複：如果人不在美國的話

If you are in China (outside US) and lose your green card there, you need to go to the US Consulate to get the transportation letter to enter US, then file I-90 to get the replacement. No choice.

See these websites for applying for transportation letter:

http://www.immihelp.com/greencard/lost-stolen-greencard-transportation-letter.html

http://guangzhou.usembassy-china.org.cn/transportation-letter-application-for-losing-green-card.html