Aiming at the technology status that the single channel laser is usually used to measure the dynamic shading effect of smock screen in the field,a novel measurement method is proposed for smoke screen shading effect by using two-beam laser,the combined technical problems such as mixed laser signals sorting and code identification,designed measurement scheme and equipment layout are also solved based on the two-beam laser measurement system,the real-time and dynamic smoke screen transmissivity is obtained by utilizing two-channel laser measuring technique.The testing results shows that the novel measuring method is succeeding in increasing the sample size about smoke screen position and laser pathway,the high-randomness shortcoming of the widely used single-channel measurement of smokescreen transmissivity is decreased,and the degree of confidence on the measuring results and smoke screen utilization are also increased effectively.