The city public security problem is not only one of the most prominent and difficult problems in city system. As a super-large city，Shanghai faces the same public security problems as other super-large cities. At the time，Shanghai also has its own public security problems for economic and social development. The unique natural environment and extreme weather conditions，the international macro environment changes，population increasing，urban spatial layout，the economic and social transformation and so on brought these problems. Shanghai public security in not isolated，but with the economic and social development. The public safety management must be gradually market-oriented and socialized. I is the participation of social will support four-center and international metropolis construction.