Abstract:Android is the mobile operating system which has the highest market share of 84.2%. Its open access mechanism not only brings more users and developers, but also a lot of security issues. According to the survey by China Internet Network Information Center, only 44.4% of users will view the authorization instructions carefully in the process of downloading and installing an application. Most people have the risk of blind authorization. For software developers, due to the lack of strong supervision and proper permission specifications, application authority abuse in the procedure of Android application development has been widespread, which seriously affected the code and quality specifications. Besides, the user's blind authorization and the software developer's permission application abuse has become the main reason for the users' information leakage. In this paper, based on the existing permission detection scheme, it designs and implements an abuse of authority detection system named PACS. Test results show that 812 applications abuses permission among 1077 applications, which account for about 75.4%. Meanwhile the sampling of test results proves the accuracy and validity of the PACS's results.