how can i get M visa in india ? and where do i apply in india?

You can firstly prepare the relevant documents, such as your passport, passport copy, application form attached with half-length bare-headed photo, and an invitation letter from your business partner in China. Then go to the CVASC office to submit your application. There are CVASC offices in Bombay, New Delhi, and Calcutta. You should go to the one which is reponsible for your residence address.