In order to improve the avionics system simulation software reusability and the development period, Specific to navigation system design method and visualization implementation ideas for research. To expound the simulation system modularization dividing method, use IDATA as a graphics drawing and rendering tool to model the simulation system of visualization method of realization. Elaborate the application of aircraft training simulator’s navigation system developing process, design demonstration and implementation effect. After the engineering practice verify, the simulation system and its visualization method can guarantee the program portability, reduce the data display and visualization application graphic development and integration debugging time.