回复：请教：父母移民问题

父母在中国。我是美国公民。如果给他们申请绿卡的话，大概需要多久？
-Serveral months to one year.

我是不是只需递交I-130，不需递交I-485？
-Correct. File I-130 with the required document first, andthen wait for National Visa Center (NVC) to contact you for other required document later.
I-130批需要多久？
-Several months.
I-130批下来后，又需要等多久才可去大使馆拿移民签证？
-Several months.
拿移民签证后是不是就是永久公民了，不需再递交I-485？
-Correct. When your parents enter US with the immigreation visa, they will become 永久公民 immidiately at the port of entry.

多谢指点！