The mobile Internet owns the most Internet users in China; it promoted the redistribution of social time and the reconstruction of social structure. Giddens found that people would form routine social behaviors and activities in different spatiotemporal domains. With the development of mobile Internet, the distinction of online life and offline life is more obvious. With the series quantitative research, we try to explore the new life rhythm of offline space and online space. According to our analysis, people are spending less time on housework and traditional media use and put more time on leisure activities and social interaction. The cognitive surplus has come into being like Clay Shirky said. And new various life rhythm and behavioral modal is separated in the online space. The leisure time at night after the dinner is the highest mobile Internet using time band. With the strengthening of mobile Internet using, the social structure is more diversified, changeable and flexible. And the social spatiotemporal connections are undergoing new separation and reconstruction.