Abstract: IR images of airplane generated by simulation are very important data source for IR based air target identification. To improve the simulations validity and real time performance, amendments on the existing IR simulation algorithms were proposed in this paper, a simulation platform was also built. First, IR radiation characteristics of the whole aircraft was analyzed comprehensively. IR calculation models of aircraft components such as engine, plum, and skin were established based on the blackbody radiation theory. Amendment on the calculation methods of skin temperature and aircraft velocity on IR model were proposed. Then the simulation platform was built based on OpenSceneGraph(OSG) in VS2005 C++, this system can dynamically change the aircrafts IR performance and generate the IR images of the aircraft in real time. Simulation result demonstrates that the proposed IR model can provide more accurate data sources for the IR based air target identification than existing models. Besides, the single target simulation can be updated up to 100 frames per-second which is sufficient for real-time simulation.