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随着特高压（UHV）输电工程的建设,特高压输电线路对邻近无线电台站高频信号的无源干扰是目前迫切需要解决的问题。针对矩量法求解输电线路无源干扰存在的计算量过大,无法求解线路对高频信号无源干扰的缺点,基于输电线路无源干扰面模型,提出了采用一致性几何绕射理论（uniform geometrical theory of diffraction,UTD）求解输电线路对高频信号无源干扰的思想。根据一致性几何绕射理论中的边缘绕射和表面绕射模型,研究了铁塔角钢和导线面模型在高频入射线照射下的绕射场,并介绍了该绕射场的求解方法。结合具体的工程问题,对极高频信号的输电线路无源干扰问题进行了分析研究。经验证,采用UTD方法可以实现对输电线路高频信号无源干扰问题的求解,也可反映各种线路条件下无源干扰的变化趋势。“,”How to avoid the high reradiation interference in adjacent radio station has become an important issue puzzling the routing choices of UHV transmission lines. To improve the method of moments which could not be used in high frequency interference solution, such as excessive computation, we proposed a calculation idea using uniform geometrical theory of diffraction（UTD） based on the reradiation surface model of power lines. According to the models of edge diffraction and surface diffraction defined in UTD, we researched the diffraction field of surface models with angle steel in power tower and conductor, and introduced the solution method. Using a specific engineering case, we analyzed the reradiation interference on special radar in extremely high frequency from UHV transmission lines. It is proved that the interference from UHV transmission lines in high frequency can be mathematically calculated by UTD method, and its trend changes can be reflected by various conditions.