I have iranian pasport with us green card visiting in us now how can i get visia to china now?

Hi, Mary, you need to apply a L visa at the embassy or consulate in the US. The following documents is needed beforehead:
1.Passport – You should submit your original passport that is valid for at least another 6 months with at least one blank visa page and a photocopy of the information/photo page.
2.Visa ApplicationForm – V2011A and V2011B
3.Photo – Please affix one color photo on the Application Form. The photo should berecent, front view, in 48mm x33mm size without head covering.
4.Your valid U.S. visa.
Good luch with your visa application, and hope you have a good visit to China!