In the course of data research and analysis，we selected 892 popular apps of the Android platform in eight categories of finance，shopping，healthcare，social networking，gaming，entertainment，transportation and travel，and lifestyle services as samples. By using automation testing we found mobile applications security risks in those apps. In the meantime，we distributed about 200 questionnaires to mobile application developers，project managers and security experts and attempted to interpret the cause of the mobile APP security problems. Finally，we also sent nearly 300 questionnaires to ordinary users to understand the needs and location of application security among ordinary users.