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http://www.state.gov/documents/organization/87531.pdf
第八-九頁, nonimmigrant visa for adopted child.

這裏麵隻有兩種情況被收養的小孩可以有把握地拿到非移民簽證
（1）被居住在國外的美國公民收養，計劃訪問美國但是沒有在美國永久居住的打算
（2）被在美國的非移民父母收養（比如F，J等）可以作為父母簽證的家屬（F-2, J-2）etc.
最後
（3）被居住在美國的美國公民收養的小孩，如果簽證官相信小孩訪問後會離境，可以發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.

雖然這個規定沒有說綠卡持有者收養的小孩，但是政策原因應該和以上類似，我並不看好樓主能夠成功地拿到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.

• 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.

所有跟帖： 

• "for a temporary visit",這個孩子非常明顯是與父母永久住在一起（成年前，>10年） -白兔媽- ♀ (148 bytes) () 08/05/2015 postreply 08:46:31

• Reply -863211- ♂ (831 bytes) () 08/05/2015 postreply 09:17:30

• 問題的關鍵在於父母雙方都有綠卡，都在美國工作，假如是H1就沒問題了。 -白兔媽- ♀ (0 bytes) () 08/05/2015 postreply 09:29:23

• Reply -863211- ♂ (1384 bytes) () 08/05/2015 postreply 10:09:15

• 許多事情都是需要take risk，但不是所有事情都可以afford risk。 -白兔媽- ♀ (243 bytes) () 08/05/2015 postreply 12:20:19

• Reply -863211- ♂ (1358 bytes) () 08/05/2015 postreply 12:53:40

• 俺也不看好這種B-2 簽證，一旦拒簽，那領養了的小孩咋辦？樓主又沒時間呆國內兩年， -水中撈月- ♂ (146 bytes) () 08/05/2015 postreply 09:11:24

• Reply -863211- ♂ (624 bytes) () 08/05/2015 postreply 13:14:23