Abstract: Following the principles of social main contradiction transformation in the new era is the essential basis to precisely study and judge the contradiction of China's mass sports demand and supply.Recognizing and guiding the changes of mass sports demands as well as improving and promoting supply quality are the main threads and the key to mass sports development.By using the method of literature review, the article discussed the main characteristics of demand changes, and the main problems of supplies in mass sports.It holds that we should follow the thought of people-centered to recognize their ever-growing sports demands; we should speed up the construction of public sports service system to ensure people's basic demands; we should stimulate the vitality and potential of sports market to meet people's dynamic sports demands; and finally we should make sports social organizations play important roles to adapt to people's various sports demands.