我父母在成都轄區，持綠卡，不太喜歡美國生活，回國已經快2年。
現在想來看我們，據網上消息，必須先主動退回美國綠卡，同時申請B2。但是退回美國綠卡隻有在廣州領事館有相關消息，是否必須在廣州辦理？
-No. They can abandon their green card in any US consulate in China. Here is some information from US Cosulate in Shanghai, and you may find the same information in US Consulate in 成都:
http://shanghai.usembassy-china.org.cn/green_cards_holders.html
Anyway, the procedure should be the same no matter whether you do it in any US Consulate in China.
另外廣州領館明確說明必須先退回美國綠卡才能再申請B2，是否必須辦理兩次？
-No. They can do these two things at the same time.
