This paper focuses on design of integrated surveillance system simulator based on Integrated Modula Avionics (IMA) architecture.Different from the traditional federated avionics architecture, an integrated surveillance system simulator is designed by using IMA architecture.The implementation scheme for the activator, integrated surveillance system simulator, and the display and control system simulation platform is presented here.Simulation is made to verify the basic function of the integrated surveillance system, and the result shows the rationality and feasibility of the simulator design scheme.