According to the empirical relationship between the water content and visibility in radiation and ad. vection fog, the calculation formula of laser atmosphere transmission attenuation in fog weather is analyzed. Three kinds of commonly used fog attenuation empirical models are simulated by Matlab numerical value. The relation.ship between laser attenuation coefficient and visibility in fog weather is obtained. According to the shortcomings ofthree kinds of semi-empirical models, a new empirical formula containing some information such as measuring dis.tance and field of view of a receiver is proposed based on Mie scattering theory finally.