The cable erection construction are wide using in process of arch bridge construction,in order to analysis the cable force ,we proposed a simple method which used the dead load multiplication by impact coefficient instead of dynamic load to calculate the cable force,then the dynamic solving process were changed into the problem of catenary equation under the action of single force.On the basis of project of Mo Dao Xi grand bridge,the method of cable force calculate were used in the project of cable erection.The value of cable force between calculated and measured was fitted.The research show that the cable safety factor are higher than 4 in process of bridge construction.The calculation method that we proposed are apply to the arch bridge construction.%缆索吊装施工方法广泛应用于拱桥建设中，为分析吊装过程中缆索索力大小，提出一种以静荷载乘冲击系数来替代滑移移动荷载，将缆索吊装动态过程简化为静态集中力作用下悬链线方程求解的方法。以磨刀溪特大桥施工为背景，应用该方法计算吊装系统的缆索施工阶段的索力，同时对比试吊装试验的实测数据值。研究表明：在吊装过程中，每个施工阶段缆索强度安全系数大于4，满足施工安全。本文提出的简化计算方法适用于缆索吊装施工的缆索索力计算。为拱桥缆索吊装索力计算提供参考。
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