The invention discloses a mandatory access control and power combination-based method for removing a Root authority. The method comprises the following steps of (1) classifying programs with S bits; (2) giving power to the classified programs with the S bits according to the requirements and giving the power to binary executable files corresponding to the programs; and (3) carrying out comparison validation on a user of sending out operation execution and the type of a to-be-executed target program, if the comparison validation is passed, associating the user with the target program and running the target program, and if the comparison validation is not passed, not associating the user with the target program and refusing an operation execution request of the user and exiting. According to the mandatory access control and power combination-based method for removing the Root authority, mandatory access control is achieved by using an S-bit program mechanism of Linux, so that a common user obtains the privilege of a superuser after executing the programs; the method disclosed by the invention is high in universality, good in compatibility and high in flexibility; and the security of an operation system is improved.