Based on the segmental catenary theory, considering the change of anchorage point position and tower height of self-anchored cable-stayed suspension bridge, the calculation principles and procedures for cable shape-finding and the zero-stress length of main cable under finished bridge state and cable-finished state are introduced respectively. Considering the influence of saddle, the program of cable shape-finding calculation is compiled. The analytical results of some examples show that this method is accurate and feasible, and the program has characteristics of fast convergence, high calculation accuracy and convenience for project application. The method can well guide the design and construction of self-anchored cable-stayed suspension bridge.%基于分段悬链线理论，考虑自锚式吊拉组合体系桥主缆锚固点位置及桥塔高度的变化，分别介绍了其成桥和空缆状态主缆线形及主缆无应力长度的计算原理和步骤．考虑索鞍的影响，编制了主缆线形计算程序．算例验证结果表明该方法是正确可行的，所编程序具有收敛速度快、计算精度高、便于工程应用等特点，对自锚式吊拉组合体系桥的设计和施工都具有很好的指导作用．
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