The research significance of the optical system is described, and the basic design principle is determined. Gaussian optical structure model and design of a collimator and a telescope are performed. The detailed mathematical models are established and calculated. Based on target coupling optical path structure, ZEMAX software is used to design the optimum optical system. The result is evaluated and the conclusion is drawn. The field test issues of infrared precision guided system dynamic tracking characteristic are solved through the system. The development of infrared blackbody tracking target ground equivalent testing is promoted to provide a very important hardware support to the improvement of simulation technology performance.