使用Mie散射激光雷达在阴、雾和晴三种天气状况下采集了大气回波信号，从所测数据反演气溶胶消光系数的过程中发现，气溶胶后向散射消光对数比对反演结果存在较大影响。在阴天天气下，当后向散射消光对数比从0．7变化到1．0时，气溶胶消光系数反演结果相差近5倍；对晴天天气，反演结果相差近3倍；而在有雾天气，其反演结果变化不大。通过参考大气能见度因子对消光系数进行修正，并从而获得对应的后向散射消光对数比，给出了一种根据天气状况确定气溶胶后向散射消光对数比的新方法。实际反演计算表明，用此方法可获得与实际更为接近的气溶胶消光系数。

By using Mie scattering lidar,return signals in cloudy,foggy and sunny weather are measured. In the process of inversion,selection of the logarithmic ratio of aerosol backscatter-to-extinction has a large effect on extinction coefficient. For cloudy weather,when the logarithmic ratio of aerosol backscatter-to-extinction changes from 0.7 to 1.0,the change of aerosol extinction coefficient is 5 times,for sunny weather,the change is near 3 times,whereas for foggy weather,the change is not much. Using visibility data obtained by meteorological observation,corresponding logarithmic ratio of aerosol backscatter-to-extinction is obtained. A new type of method for deciding logarithmic ratio of aerosol backscatter-to-extinction based on weather conditions is proposed. The corrected results are close to the real atmospheric conditions.