In recent years, the air pollution in China is becoming more and more serious, especially in Beijing. In this paper, an air pollution information management system was established by using ComGIS component of ArcEngine and Visual C# .NET platform and SQL Server technology. The system consists of three modules, including basic function, spatial analysis and early warning. It can monitor air pollution from different angles. In order to realize the simulation of pollution diffuse and the visual management of air pollution, we developed this system to monitor and analyse the air pollution situation in Beijing in quasi real time. Air pollution concentration data recorded by the monitoring station in Beijing on May 23, 2015 was obtained. The results showed that the severe atmospheric pollution in Beijing was mainly distributed in Chaoyang, Xicheng, Dongcheng and Fengtai districts. The area with severe PM2.5 exceeding the standard was located near the Monitoring station of Yizhuang Development. However, it indicated that the severely polluted areas extended from Daxing and Tongzhou districts to Xicheng, Dongcheng and Chaoyang districts when simulating the diffusion of PM2.5 pollutants by adding wind power and wind direction data on the same day.