Method and device for dynamically updating and controlling software by using patches

The invention discloses a method for dynamically updating software by using patches. The method comprises the following steps of: extracting a preset parameter of a substitute function from a target file to form a new target file which only comprises the substitute function; and generating the patches according to the new target file and a kernel image source file. Moreover, the invention also discloses a device for dynamically updating and controlling the software by using the patches. The method and the device are implemented, so that a memory space needed during patch loading is reduced greatly.