Abstract: In this paper, the Android operating system monitoring mechanism based on the technology of FileObserver is analyzed. In allusion to the problem of the surveillance results without information of the application that access the monitored file, the joint monitoring technology based on script command is put forward. The key technology and implementation methods on joint monitoring technology are elaborated in detail. This technology is tested on U8825D huawei mobile phone with Android OS 4.0. The result of the study shows that the joint monitoring technology based on script commands can get access to the information about the access applications. Finally, We analyze the performance of monitoring technology of the joint script command and put forward an improved scheme for some performance problems.