Social construction has been raised as a national development strategy，which marked that China has developed to a new stage of people-oriented value. Social harmony is the essential attribute of socialism with Chinese characteristics. Sports are highly conformed to social construction value orientation because of its innate humanistic spirit. Based on its many social functions，sport has unique functions in social participation expanding，social inclusion promoting，social governance improvement，social value spreading. But these social functions won’t work automatically. If we want to active them，we need to change our ideas，make mass sport promote social construction and elaborate small sports groups’ social function. The basic goal of mass sport should be changed from people nature fitness attribute to comprehensive development of social attribute. “Government standard” of developing mass sport should transfer to “society standard”. We need to find a combination of mass sport and social construction，and make them promote each other. Thus，promoting social construction by mass sport is a practical need of China in this social developing period. Combination of mass sport and social construction will open a broad prospect for sport.