The invention provides a method and a device for distributing computer system permissions. The method for distributing the computer system permissions includes the following steps: detecting a start-up mode and starting a designate function when a keyboard password start-up mode serves as the start-up mode. Due to the fact that under the condition that the keyboard password start-up mode is adopted, a user needs to input correct passwords to start a computer, when the designate function is started, setting through a basic input / output system (BIOS) interface is not needed, so that other users can not know wether the computer is enabled to start the designate function, computer system permission distribution is enabled to have imperceptibility, and accordingly safety of the computer is improved.