Documents required for visa application??

To apply for the business M type entry permit, you should prepare the following documents, including your passport, a copy of its photo page, a completed application form with your recently-taken bare-headed photo stuck on it, and an invitation letter from your supplier in PRC.

Hi, I got an invitation letter from the company that stated the date of visiting. Now I would like to extend the visiting date by one week. Do I need other invitation letter?

Andualem, yes, you need to get another invitation letter for the extension.