针对雨雾共存的特殊天气条件下大气衰减计算模型误差较大的问题，由雨雾天气的物理现象入手，对现有模型进行修正，提出更为精确、合理的大气衰减计算模型，并采用该模型对无线光通信系统的链路余量进行仿真分析。结果表明，采用已有的理论模型计算将引入较大的系统误差，而修正的计算模型更加精确。提出的修正模型和分析结论对无线光通信及其他相关领域中大气衰减的估计和评价具有重要指导意义。

For the problem of the big errors in the calculation of atmospheric attenuation under water fog weather, starting from the physical phenomena of water fogs weather, through the revision of the existing model, a more precise and reasonable model was proposed. And using the proposed model, the performance of free space optical (FSO) communication system was analyzed, the simulated results pointed out that the relative errors caused by the existing model can′t be ignored. The work can provide a theoretical basis for the evaluation and estimation of FSO communication system and other related domain in water fogs weather.