Calculating 1.06 μm laser attenuation coefficients usually depends on experience data or typical aerosol model.Therefore, theory calculation can not be combined with actual aerosol condition, and the attenuation coefficient precision can not be satisfied with the requirements of laser weapon. The article validates difference between experiment data and attenuation coefficient whose calculation depends on typical aerosol model by experiment of laser atmosphere attenuation in Suizhong area, namely, the aerosol model is different from actual aerosol condition. According to experiment data, analysis of function relation between aerosol number density and visibility, provides a kind of method for engineer calculation of laser atmosphere transmission simply and exactly.