Abstract: In order to realize the static centroid balancing of missile borne infrared cameras, a set of counterweight load combination with less quantity, light weight, fine technology and interchangeability is designed under requirements of the whole machine quality. In order to design the counterweight load quickly and efficiently and arrange the installation position of the load combination reasonably for the missile borne infrared camera with small space volume, a method is proposed to simulate the centroid position of the original prototype by using the three-dimensional design software Creo4.0, and then calculate the coupling relationship between the mass of the counterweight load and the centroid position by using the torque balance principle at two points of the space. On the basis of summarizing the design principles of counterweight load, the counterweight load scheme is designed by using creo4.0. After projection, processing, assembly and strict centroid test, the results show that the method can achieve the centroid balancing function well, and make the missile borne infrared camera meet the centroid requirements. Compared with the trial method, this static centroid balancing method has obvious advantages of high efficiency and reasonable layout.