I came to china on business M type for one month and the visa expired how can I renewed it?

Hi, you can extend it 7 days earlier before it expires.
If it has expired, you cannot extend it anymore. If you overstay in mainland China, you should report your situation to the local police station at present, and then pay the fine CNY500 per day; the capped amount won’t exceed CNY10,000. Afterwards, you can apply for an exit pass to leave China.