The Chinese Embassy in U.A.E. only accepts visa applications of the U.A.E. citizens and expatriates who reside in Abu Dhabi and Al Ain. I Think you can apply for a China visa from the China emabssy in UAE with the following documents:
1. A completed visa application form, which must be signed by the applicant or parent and guardian if the applicant is under 16 years old.
2. Original passport, which must be valid for more than 6 months and has more than two blank visa page left, and a passport copy (A-4 size).
3. A copy (A-4 size) of the U.A.E. residence visa, which should be valid for more than 6 months, if non-U.A.E. national.
4. A photograph as in the passport.
5. A signed and stamped employment/no-objection letter from the company which clarifies the applicant's full name, nationality, passport number, position,salary, the purpose of the visit etc. Or a copy of the trade license, if self-employed.
6. A copy of the round air ticket booked, hotel reservation, an invitation letter and personal bank statement, if required by the consular officers.

Dear Sarah,
Pls advice if tourist visa to chaina requies an invitation? as ive been told that uzbekistan passport holders may get business visa only and i need someone to send me invitation. Is it true?

If you can get the invitation letter, just prepare it in case that the embassy requires.

Dear all!
I went to embassy with required documents as you adviced me,but agent in embassy told that for uzbekistan sitizen's thay not issueing tourist visa,it must be business visa only.I’m very surprised ,its first time I've got refuse for tourist visa. Can u tell me if its really true that I cant get tourist visa or it was some miss understanding between me and agent.

As far as I know, Uzbekistan citizens should apply for tourist visa through authorized travel agencies by the Chinese embassy in Uzbekistan. therefore, I guess that you have to go to Uzbekistan to apply for tourist visa to China.