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多谢8老师的解答！所以说，如果在中国每次待的时间不超过6个月，比如每隔5个月来美国待一个月，这样弄几年以后，有可能因为没有每年6个月以上的时间呆在美国，导致绿卡被海关或者USCIS收回或者不能renew吗？

-That will be trouble. Your parents must live in US physically for more than 6 months every year to keep their green card. Also, they cannot go back and forth between US and China very often, e.g., live in US for two months and go to China for two months; then go back to US for two months and leave again, and so on.

As I said, the green card is for them to live in US permanently, not use it for border crossing card. If the immigration officer considers they do not have the intent to live US permanently, their green card will be revoked.

再次感谢！