A method of dispersion of light prism-based half kind simulation system was proposed for laser fuze.The lens optic coupling system were adopted to couple the light beam of sending window into the receiving window,Then real-time power attenuation simulation was realized by means of a Light switch and a Electric-controlled intensity attenuator.After being attenuated,the optical signals returned to windows of receiver.In the system,the optical coupling system is used to propagate laser pulses,so it can accurately simulate the reflective laser signal which laser fuze has transmitted such as passing across the target.At the same time,it can testify the signal processing algorithm used in laser fuze in the laboratory through controlling attenuation of laser signal in real-time.By theoretical analysis,system composition and detailed design of every part were proposed,and then the design was verified by conclusion.