I am Mansoor. I want to visit china for a month.

Mansoor, you can visit almost any mainland China city as long as you can get the visa. However, you can't apply for it on your own. You have to join in a travel group and entrust the application to a travel agency. The visa itself is free of charge, but the agency will charge service fees from you. By the way, if you attend a tour group, the cost will be determined by the travel agency, so I cannot tell an exact answer.