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多谢多谢8老师的详细解答！～ 还有一个问题：那I130交了之后I485大概什么时候交？

-About 10 years later.

是等移民局通知吗？

-Check the visa bulletin every month to see whether the priority date is current. If yes, file I-485. However, F4 category (US citizen sponsoring brother/sister) takes about 10 years for the PD to be current, so he needs to wait for a long time to file I-485.

还有他留学身份毕业后如果呆在美国，等排期的时候不是就黑了，那等排期到了对I485申请有影响吗？

-As I responded above, he needs to have his own status for about 10 years to file I-485. Otherwise, he may have to leave US and wait in China.