Can I obtain multiple entry chinese visa?

Yes, you could apply for the multiple entry M visa, but for first time applicants the embassy will normally grant a single entry insead. For M visa, the basic documents are your passport, the completed visa application form with a passport photo. The additional documents are:
1.Printout or photocopy of "Invitation Letter(TE)"or "Verification Letter of Invitation".
2.Invitation letters from your trade partner.
3.A supporting letter from the organization which you serve in(organization address, telephone number and the detailed visiting purpose should be correctly and clearly stated).
4.Less than three pages of the copy of personal bank statement (please bring the latest 3 months original one).
5.Photocopy of Certificate of Incorporation of applicant.
6.Photocopy of business license of the inviting entity.
7.Photocopy of ID of the one who signed the invitation letter.
The walk-in srevice is acceptable in the embassy.