All American visas are filled out online. This form is called DS- 160 and is available on the website of the American Embassy in China. There are online application instructions for DS- 160. After filling in and submitting online, you will be given a bar code, which you need to show during the interview.
In the upper right corner of the page, a downloadable document in PDF format is provided. You can download the free version by clicking the link above.
The following is a web link:
References:/ds160 instructions.html.