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如果某種特殊原因必須放棄現在的綠卡，問題

1:是在美國境內先放棄綠卡申請，

-You had better go back to China and then, submit the green card abandonment application, i.e., file I-407. See thiss link:

Abandonment of Status (Form I-407) - U.S. Embassy & Consulates in China

If you give up the green card in US, then you will have no a legal status in US, resulting in your unlawful presence.

2:還是等到在國內呆上2年（綠卡還在有效期，但離美超過6個月）是否屬於自動放棄，哪還需要填表嗎？

-Just give up it when you return to China. see above.

不隻哪個好點，還是有其他方法

3:放棄後申請十年旅遊簽證會批嗎？

-Normally yes.

4:因孩子和愛人都是美公民，再次申請綠卡容易嗎？

-Yes.