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我看官方網站上是這麽說的：
Have continuous residence in the United States as a green card holder for at least 5 years immediately preceding the date of filing the application 。
Be physically present in the United States for at least 30 months out of the 5 years immediately preceding the date of filing the application。
第一條說5年都要在美國，第二條又說物理上30個月以上。

我媽媽拿了綠卡，她要是每年在美國住6個月，中國住6個月。5年後能申請公民嗎？
-Yes, but if she goes forth and back between China and US too often, the IO at the port of entry may give her trouble. The green card is for her to stay in US permanently, not for her to use it as border-crossing card.

 多謝！