Provided are a method and device for access control, said method comprising: within a preset count time, counting the number of times each access source performs access and the number of access violations concerning each virtual storage block (S201); according to the number of times of access of said access sources and the priority characteristics of the access sources, obtaining the arbitration weights corresponding to the access sources (S202); according to the number of access violations of each virtual storage block and a preset threshold for the number of violations, determining a virtual storage block that must be remapped and remapping, according to a preset remapping policy, said virtual storage block needing to be remapped (S203); according to said arbitration weights corresponding to the access sources, allocating a corresponding arbitration period to the virtual storage blocks after remapping (S204).