Yes, the DS-160 can be filled out in the USA.
It is advisable to save your progress every now and then, since the system still have some glitches and every 20 minutes the session expires. It can be very frustrating.
Once you finish filling out the DS-160, you need to print the confirmation receipt with the bar code and mail it to your father in China.
You can prepare the DS-160 for your father but he must review the form and electronically "sign" the form on-line. The link for the DS-160 is https://ceac.state.gov/GENNIV/General/complete/complete_gettingstarted.aspx?node=Getting%20Started
From the DS-160 Website -- Notice 22 C.F.R.6 41.103 requires an applicant to sign and submit his or her own Nonimmigrant Visa Application unless otherwise exempt. Although the applicant may receive assistance from a third party in preparing the application, the applicant is required to click the “Sign Application” button at the end of the application. The applicant's failure to sign the application may result in a termination of the application.
Avi Friedman| Attorney at Law | Wolfsdorf Immigration Law Group | 1416 2nd Street | Santa Monica, CA 90401 | (T) 310-570-4088 x249 | (F) 310-570-4080 | email@example.com | www.wolfsdorf.com | Offices in Santa Monica, CA and New York City
This message is provided for general informational use only and is not specific legal advice. This communication does not create an attorney-client relationship.