With the rapid development of laser technology and laser weapon,it is more and more important to study the interaction between laser and matter.The optical properties of K9 spectralite was introduced.The interaction(reflection,scattering and absorption)between high-energy laser and K9 spectralite was simulated by using Tracepro optical simulation software.The key factors affecting the interaction between high-energy laser and K9 spectralite were obtained.The correctness of the conclusion was verified through the experiments.This study provides a reference for the further research of laser weapon.