http://beijing.usembassy-china.org.cn/visa_forms.html

On Line Electronic DS-156 The online DS-156 form contains a bar code, which will allow us to electronically transfer data.  Once the application form is completed online, it must be printed, and then submitted at the time of the visa interview. Click here to learn how to fill out the online DS-156 form. 

DS-157 Supplemental Nonimmigrant Visa Application All applicants 16 years of age and older must complete the DS-157 application form, which is one page. Click to download the DS-157 form, type your answers in the space provided below each item and print out the completed form. You don’t need to fill out a Chinese DS-157, but if you need its Chinese translation to help understand the English form, click here. (Note: When filling out Item 3 “Full Name (In Native Alphabet)”, Chinese applicants should write down their full name in Chinese characters.  Chinese applicants must also fill out items 5, 6, 7, 12 & 17 in Chinese characters.)