The invention discloses an application freezing method and system. The method includes the steps of running an application, receiving a running instruction of a function of the application, judging whether the function is frozen or not, if yes, forbidding running the function, and if not, running the function. Through the technical scheme, when a user enters the application to run a certain function module or the system automatically runs a certain function on the background, the system can detect whether the function module is frozen or not, if yes, the function module can not run, and therefore system resources are saved. In the process, other functions of the application can still be used, so the user freezes part of the functions of the application rather than the whole application, it is ensured that other functions are normally used, and the effects of lowering power consumption and improving device performance are achieved.