With the rapid upgrading of intelligent mobile terminal equipment, the mobile terminal applications of android operating system also have more species, and their update is faster. The rapid development of android smart phones makes android security mechanism a hot issue for developers and users. After a brief analysis of present situation and the security mechanism for the android security, aiming at the three security problems, the corresponding solutions are proposed. With practical examples, the method is realized a relevant security mechanism solution. Practice has proved that the method improves the security of the application.