For a mixed transport airport, the efficiency of transport flight and the efficiency of flight training on traffic pattern are mutually affected. In order to make the runway capacity evaluation under this type, a runway capacity evaluation model considering the visual flight training of takeoff and landing routes was proposed. The model considers the effect of visual interval on take-off interval of training flight, abstracts the operation process of aircraft occupying the runway, takes visual interval as the key factor, analyzes and discusses the influence of transport type and aircraft type on runway capacity. The results of Anylogic simulation show that the service capacity of runway can be greatly improved by using visual interval, and can increasing capacity about 55%, which verifies the effectiveness of the method and model.