Security detection method, device and system of application installation package

The invention provides a security detection method, a device and a corresponding system used when an application installation package is operated. The method comprises the following steps: detecting an operation request of the application package in a terminal, responding to the detected operation request, analyzing the application installation package so as to acquire critical security information, comparing the acquired critical security information with original critical security information corresponding to an application, and terminating the operation of the installation package when the difference of the compassion result exceeds a security threshold. According to the embodiment of the invention, applications which are viciously falsified can be effectively identified and prevented.