City CBD，especially that of a metropolis，is an area where a cluster development of city economy，culture and technology exists. As it is playing a more and more important role in city construction and economic growth，CBD construction is becoming greatly important for consumption upgrading. On the basis of POI data，this report has completed a mega measurement of longitude and latitude for the CBD of four metropolises：Beijing，Shanghai，Guangzhou and Shenzhen. Furthermore，it makes a specific analysis on the dynamic regularity of CBD consumption of the four super large cities and gives the following suggestions to promote CBD consumption upgrading，such as accurate tracking of consumption needs，developing consumption model based on mega data and constructing first class international consumption environment.