Abstract: The layout and operation principle of multi-spectrum laser composite point target simulation dome is given, which is used for research, development and validation of fire control and electro-optical seeker systems. Three laser wavelengths(0.65 m, 0.808 m and 10.6 m) meet the dynamic simulation test requirements of TV (0.4 m～1.1 m) and long-wavelength infrared imaging (8 m～11.5 m) electro-optical tracking system. The diffuse reflectivity of 12m radius dome screen is greater than 0.7 (0.4 m～12 m), target motion range is 0 ~ + 90 in azimuth, and -90 ~+9 0 in elevation. This technology is developed for the hardware-in-the-loop simulation of vehicle borne air-defense electro-optical fire control system and the tracking precision is increased from 0.4 mrad to 0.2 mrad.