What trading policy does the US government hold toward China at present time?

Hi, I want to know kind of tading policy does the US government hold toward China, especially the discriminative ones such regulation for export to China, or tariffs for imported Chinese productions. What acts does the legislative institutions do to regulate, restrcit or promote the US-China bilateral trading because I want to finda policy to analyze, and reporting its benefit/cost analysis. I would also like to know where can I find a website that could offer me the relative anwers. Thank you for answering.

GATT