http://www.state.gov/documents/organization/87531.pdf
第八-九页, nonimmigrant visa for adopted child.
这里面只有两种情况被收养的小孩可以有把握地拿到非移民签证
(1)被居住在国外的美国公民收养,计划访问美国但是没有在美国永久居住的打算
(2)被在美国的非移民父母收养(比如F,J等)可以作为父母签证的家属(F-2, J-2)etc.
最后
(3)被居住在美国的美国公民收养的小孩,如果签证官相信小孩访问后会离境,可以发B-2;但是:
However, for cases where you are not satisfied that the child will return to their place of residence, a NIV should not be issued to the child. Such an issuance would violate the law, circumvent scrutiny intended to protect the child and adoptive parents, and place the child in an untenable immigration predicament since DHS regulations generally prohibit the approval of an immigrant petition for a child who is in the United States either illegally or in nonimmigrant status.
虽然这个规定没有说绿卡持有者收养的小孩,但是政策原因应该和以上类似,我并不看好楼主能够成功地拿到B-2.
-The adopting parents (green card holder) can not sponsor the child green card when the adopted child applies for B-2 visa. So, it is hard to say the child wants to immigrate to US. We have seen may US citizens sponsor their brother/sister green card application, and their brother/sister still can get B-1/B-2 visa to enter US even if after the I-130 filing (immigration intent) because they can not immigrate to US when they apply for B-1/B-2 visa due to unavailability of visa number. The adopting parent can explain that the adopted child's visit is temporary and will return to China to apply for the immigration visa in the future (if any). So, practically there is very good chance for the adopted child to get the B-2 visa.
Here is a successful example at this link (Q$A1):
http://www.alanleelaw.com/english/qa/QA2013-11-10.html
Also see the following at:
http://www.apsanlaw.com/law-152.b-2-tourist-for-pleasure.html
Spouse or Child of U.S. Citizen or Lawful Permanent Resident.
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A foreign spouse or child, including an adopted child, of a U.S. citizen or lawful permanent resident may be classified as a B-2 Visa visitor if the purpose of the travel is to accompany or follow to join the spouse or parent for a temporary visit.