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尊敬的8老师，父母拿到AP后回国，他们现在不想再回来了，现在就在等面试这一项，但是他们也不想等了。请问放弃绿卡申请需要做什么吗？

-You write a letter to USCIS to request withdrawal of the I-130s, respectively; and your parents write a letter, respetively, request withdrawal of their I-485. Provide teh copies of the I-130 approval notices and the copies of the I-485 receipt notices. 

以后他们还想用十年签证来美国旅游，会不会受影响？

-May need to explain that they abandon the green card application voluntarily.