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EB1a批准了，首先感谢论坛，特别是8老师的悉心指导。

现在我回到国内了，那么下一步要准备什么，还要提交什么材料，是不是需要在美国那边先找到工作offer？请教，谢谢大家。

-You need to find a job in the same field. You can either enter US to file I-485 or apply for the immigrant visa in China after you find a job.

By the way, if you did not indicate in the I-140 that you will apply for the immigrant visa in China, you need to file I-824 to request USCIS to forward your I-140 to NVC to process for your immigrant visa application if you want to apply for it in China, not come back to US to file I-485.