Abstract: In order to study the smog extinction to the laser signal in laser beam fide guidance,the transmitting characteristics,such as absorption,scattering and attenuation,in smog of laser at the wavelength of 1.06μm,1.55μm and 10.6μm were simulated with the method of van de Hulst.It is found that the absorption attenuation becomes smaller for laser at longer wavelength when the complex refractive index is a constant.The peak attenuation becomes smaller with the increase of the virtual refractive index.With the increase of laser wavelength,the position of peak attenuation moves toward the direction along which the radius of smoke or smog increases.The results are important reference for studying laser beam guidance.