In order to effectively evaluate the multilevel combat capability of high energy laser to intercept and destroy air threat targets such as unmanned aerial vehicle (UAV) swarm, rocket, artillery and heat-seeking missile, including remote blinding of electro-optical equipment and rapid damage at a close range, this study is carried out to modeling the damage capability of 1 μm continuous high energy laser system. Considering the effect of atmospheric turbulence, atmospheric attenuation and vacuum diffraction on laser transmission in the calculation, five types of irradiated targets are selected to obtain the effectively damaging distance by high energy laser with various atmospheric conditions. The finally simulation results show that it can achieve a multi-level combat assignment of objective blinding within 18 km and destroying the target within 3 km with good visibility condition (≥20 km). The calculation model can provide theoretical basis for the design index of laser system, and provide reliable suggestions for the capability of laser system according to different combat scenarios and combat distances.