i am plannig to attend CIMT 2013 and i need single entry visa valid for 30 days.please advise

You need apply for a F type one. You have to provide:
1. valid passport and a copy of its information page
2. Invitation Letter or Confirmation Letter of Invitation issued by duly authorized Chinese institute
3. Personal Written Statement (Covering Letter, with details as follows: A. Destination; B. name, address and contact number of the inviting(contact company or person).
4. other documents required by the embassy