他们本来没打算离开美国一年以上，所以去年底离境之前没做任何准备。 现在刚完成治疗，在年底前内过来有点困难。 还有什么办法吗？谢谢您。
-Technically, your parent can apply for the SB-1 visa to come back by providing the evidences shuch as the doctor's diagnosis, the proof of treatments such as surgery, hospital bills from the hospital. These evidences must be very convincing on preventing him/her from return to US on time.
The problem is that SB-1 application is somewhat complicate and it takes longer time and only your parent (father or mother) who has the illness can apply for it. Also, the approval rate of SB-1 visa application is low unless the evidences are very strongly convincing. By the way, your another parent who is healthy needs to come back to US before his/her stay in China reaches one year.
Here is the link for SB-1 visa application in China:
More information:
