now i am studying in china and i want to go italy for visit. can i apply from here for italy?

Yes, you can apply here. You should prepare the following application materials.
1. finished application form, a recent passport-style photo
2. passport with a validity of three months at least
3. return-trip air ticket or proof of available meanas of transportation
4. accommodation proof, hotel booking in Italy for example
5. economical proof, such as recent payment slip of your credit card in recent six months.
6. documentation of socio-professional standing
7. health insurance with a minimum coverage o 30000 Euros