for visit visa , what kind of letter and documents will be required from invitor ?

The invitation letter should contain the invitee's travel purpose, duration and accommodation in China and who will afford the expense, and the Chinese invitor's address and contacts. Besides, the Chinese invitor also has to provide photocopy of his Chinese ID card. If the invitor in China is not Chinese nationality, sent the photocopy of his/her valid passport and China residence permit instead.