为研究输电线路杆塔水平档距的折算方法，从杆塔规划入手，通过分析悬垂型杆塔及耐张型杆塔的受力特点，分析了杆塔的主要控制工况及其对选材和杆塔综合指标的影响，得出了悬垂型杆塔及耐张型杆塔设计时是否考虑档距折算的原因，并给出了悬垂型杆塔折算档距的计算原则和工程中的折算方法。

In order to study the conversion method for horizontal span of power transmission tower, the force features of suspension and tension tower are considered by starting from the tower design. The main control conditions and their influences on material selection and composite indicators of tower are analyzed. The reason is provided that the span conversion should be considered or not for designing the suspension and tension tower. In addition, the calculation principle and method of span conversion are presented for suspension tower.