My name is mohammad I am a businessmen. I am an afghan British living in kabul.

You can try to apply for it from there, but I cannot assure if you can get multiple entries at last.
If you want to apply for a business M visa, you need to provide your passport and copy of its data page, a passport-style photo, a completely filled application form, an invitation letter from your trade partner in PRC. Besides, you may also be required to provide an invitation letter from a duly authorized unit and your trade partner can get it for you, the business registration certificate, residence certificate, and at least USD 4,000 bank savings as well as non-criminal record.