A new unitized simulation testing platform is designed according to the characteristics of three technical indicators for the airborne Infrared Search and Tracking (IRST) system,which are large field of view,high spatial resolution and high scanning speed.The problem that the traditional simulation system cannot simultaneously meet the requirements of the three technical indicators is effectively solved.The simulation testing platform has five working modes and consists of four subsystems:a simulation center,an actuator,an emulator,and a display and control terminal.The actuator uses the scene generation method based on time sequence to segment the simulation scene with large field of view and high resolution into several sequence-based planar array simulation scenes with small field of view and standard resolution.The video signal and time sequence information of the planar array simulation scenes are sent to the emulator simultaneously by using the fiber network.The emulator adopts different processing algorithms to process the simulation video signal according to the working mode.The performance test results show that the platform can simulate the comprehensive performance,working modes and interface modes of the real airborne IRST system.It has been applied to the joint test of the avionic mission software and the performance test of the avionic system.