In the actual application of non-lethal laser weapon,it will be affected by atmospheric environment,which will cause laser energy attenuation and seriously affect its combat effectiveness.To accurately obtain the attenuation of laser transmission in rain,the attenuation model of laser transmission in rain is established,and the transmittance of laser in rain is analyzed.An attenuation experimental platform of laser transmission in rain is built,and the relationship between laser transmittance and rainfall intensity and transmission distance is experimentally investigated.The results show that the attenuation of laser transmission in rain depends largely on the intensity of rain and the transmission distance.The rainfall is greater and the transmission distance is farther,the attenuation is more serious.When the rainfall is 60 mm/h and the laser transmission distance is 200 m,the transmittance is less than 40%.The simulation results are in good agreement with the experimental results,which shows that the established attenuation model is consistent with the actual situation.It is also shown that the constructed laser rain transmission attenuation system can be used to study the transmission attenuation of non-lethal laser weapons in rain.It has the advantages of simple structure,easy operation and good flexibility.