A schedule/reschedule approach is proposed as a scheduling method in AMS, which is constructed by a control computer, DNC machines, automatic transportation and material handing facilities, etc., in order to increase the control efficiency of its operation system. To show the feasibility and validity of the method, the behavior of the proposed approach is examined by a series of computation experiments, in the case when machine troubles occur accidentally and when a aprocessing time of each operation varies randomly. These results show that the proposed approach gives better efficiency to AMS than a usual priority dispatching method and can be computed within a moderate computation time.