为精确计算太赫兹波大气传输吸收衰减，需建立太赫兹波传播路径模型，而后获取沿传播路径的相关变化大气参量，并通过国际电联(ITU)标准计算分段的吸收衰减值，最终进行累加计算得出总的大气衰减量值。受限于气象观测设备及手段，沿传播路径完整的大气参量难以获取。由于地球重力场产生的大气折射效应，电磁波在大气层中传播时其路径呈现曲线弯曲传播。基于区域大气再分析资料集基础数据转化的太赫兹波大气传输衰减精确计算方法，通过ITU标准这个桥梁，在气象数据和大气传输衰减间建立关联关系，最终运用在飞行器太赫兹波地面探测类工程技术上，以预估太赫兹波通信链路的大气吸收衰减值。

In order to calculate Terahertz(THz) wave atmospheric absorption loss accurately, THz propagation segmented path model should be established firstly, and continuous changing environmental atmospheric parameters can be obtained through the whole path. Each segment path’s atmospheric absorption loss is obtained by using International Telecommunications Union-Radio communications sector(ITU-R) standard, and the whole segments are accumulated to get total atmospheric absorption loss. It is difficult to obtain complete atmospheric parameters along the propagation path due to the lack of meteorological observation equipment and methods. Besides, atmospheric refraction effect appears due to the earth’s gravity, which makes curved THz propagation path. This paper discusses the calculation method of THz wave atmospheric absorption loss. Based on atmospheric observation re-analysis data, using ITU-R standard as bridge, a constructive relationship is built between meteorological data and atmospheric absorption loss. The proposed method can be used in the ground detection engineering of THz wave for aircraft, to make THz communication link’s atmospheric absorption loss estimation.