Mr.Narek, you'd better contact the Chinese embassy in Armenia to enquire the lastest requirements for tourist visa applcation, as I know, the previous requirements are :
1. Application form:

All applicants should fill in one visa application form appropriately and authentically.

2. Applicant's passport valid for at least six months with at least 2 blank visa pages.

3. One recent passport size photograph.

4. original or copy of valid Invitation letter from onbe travel agency in China authorized by Chinese government.