With a large number of Long-range Rocket Launcher weapon systems installed, the damage assessment of various guided rocket projectiles to the targets has become a major practical problem faced by military commanders during training.Based on statistical experimental methods and computer simulation techniques, this paper improves Pixel-Simulation Method, using a set of points to represent the target and damaged area, and replacing the traversal algorithm between damaged points with set operations. According to the damage characteristics of typical ammunition such as guided HE projectile, guided penetrating projectile, and guided sub-munition, damage models and their implementation methods are proposed. Simulation results show that the method is effective,which can achieve visualization of damage effects, and can provide intuitive basis and technical support for military training.