Abstract: With the popularity of smart mobile devices, the problem of data leakage of smartphones is becoming more and more important. In this paper, we analyzed the sensitive privilege and data traffic related to users’ data privacy, and designed a dynamic data leakage monitoring system, accomplishing the monitoring of sensitive privilege and data trafifc. Using the mathematical modeling method to analyze the results of behavior of monitoring, calculated the risk factor of each application at the current time. Finally, the monitoring results of the system feedback to the user in the form of data visualization, to achieve transparent private data monitoring to users.