The Seamens Church Institute (SCI) in New York have produced 2 new online guides for seafarers wishing to apply for US Visas for shore leave. According to the SCI, the United States is one of the few countries in the world requiring foreign crew members of commercial ships and airplanes to have a visa before they can go ashore.
One of the online guides is specifically for Chinese seafarers.
The online guides can be found on the SCI website here.
Please note, the SCI cannot answer any questions about visa applications.