In order to realize the auto control of ATC, it is necessary to discuss the scheduling and the time interval control of aircrafts' arrivals. This paper gives a detailed analysis of the process of aircrafts' arrivals and expounds the features of the mixed system integrated by CTDS and DEDS, which is composed of airspace, fairway, aircraft, ATC. And the analysis of the system dynamic performance is transformed into the Scheduling of DEDS and the integration of random dynamic system. The great algebra is adopted to schedule the aircrafts, and the minimum variance control is used to depress the intervals. The simulation result indicates that the integration of CTDS and DEDS is very effective, which becomes a new way of application in ATC.