为了研究降雨对星地量子链路传输质量及量子通信性能的影响，基于M-P雨滴谱和Mie散射理论，分析了降雨强度、雨滴的消光系数与星地链路衰减系数的关系，建立了降雨背景下信道容量和信道平均保真度关系的模型，并基于两粒子纠缠态概率隐形传态方案，得到了降雨环境下的隐形传态保真度。理论分析与仿真结果表明，降雨强度的增加导致消光系数增加，进而导致信道容量和信道平均保真度减小；同时，降雨引起信道纠缠度减小，从而使隐形传态保真度减小。因此，降雨对星地量子链路的性能有显著影响，需要根据降雨强度适当调整星地量子链路中的各项参数，以保证通信质量。

In order to study the influence of rainfall on the transmission quality and quantum communication performance of the satellite-to-ground quantum links, this paper analyzes the relationship between rainfall intensity, extinction coefficient of raindrops and attenuation coefficient of the satellite-to-ground links based on the M-P raindrop spectra and the Mie scattering theory, establishes the model of relationship between the capacity and average fidelity of information channels under the rainfall background, and obtains the teleportation fidelity under rainfall environment on the basis of the two-particle entangled state probabilistic teleportation scheme. The theoretical analysis and simulation results show that the increase of rainfall intensity results in the increase of extinction coefficient, which further leads to the decrease of capacity and average fidelity of information channels. At the same time, rainfall causes the channel entanglement degree to be weakened, thereby reducing the fidelity of teleportation. Therefore, rainfall has a significant impact on the performance of the quantum satellite-to-ground links, and the various parameters in the satellite-to-ground quantum links must be appropriately adjusted according to rainfall intensity in order to ensure the communication quality.