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Thank you for your reply and your links. 因领养手续已办完,请问我们得回头补办缺失的部分,such as I-800A and I-800 吗？
-Need to do it all over again following Hague Convention Adoption procedure. See:
http://www.uscis.gov/adoption/immigration-through-adoption/hague-process

我是公民，但我先生还不是公民而持有绿卡，那由他来帮我侄女重新申办绿卡，
-I am not sure whether the Chinese Adoption law allows your spouse personally to adopt the child because the child is not an orphan and your spouse is not the blood relative of the child. 

You had better consult an immigration lawyer.

请问是不是就不需要Follow Hague Convention了?