Ballistic target infrared imaging is the basis for processing the early warning information of missiles.A simulation method was given for simulating the infrared imaging of space-based infrared warning system to ballistic midcourse target.First,the point source imaging model of space-based infrared imaging was established for midcourse target.Then,the simulation architecture of space-based infrared imaging was constructed for ballistic midcourse target based on Satellite Tool Kit/Electro-optical Infrared Sensor (STK/EOIR).Finally,simulation was carried out for the infrared imaging of midcourse target (group) on multiple platforms and multiple wavebands.Analysis was made to obtain dynamic imaging characteristics of the midcourse targets.