According to Mie scattering theory, the single particle scattering characteristics are analyzed and an atmospheric scattering model of 1.06 μm laser is built.Through simulation calculation using the model, the detection direction vs scattering intensity curves in different abaxial distance and the scattering intensity vs abaxial distance curves in various visibilities are obtained. Scattering intensity is not only influenced by meteorological visibility but also by propagation distance. The model is verified with practical tested data, the results show that the tested data accords with the simulated data approximately.