Point out in cable-stayed bridge without back-stays design,construction,management has a lot of uncertainty,random factors,if u-sing the deterministic analysis,possible misclassification of structure. In this paper,through the establishment of no back-stays cable-stayed bridge girder,cable and tower three component functions,using the related theory of reliability,the results of calculation and analysis is given to optimize the structure design.%指出在无背索斜拉桥的设计、施工、管理中存在着大量不确定性、随机性的因素，若采用确定性的分析，有可能对结构产生一定的误判，通过建立无背索斜拉桥主梁、拉索、斜塔三大构件的功能函数，运用可靠度的相关理论，对其进行理论计算分析，并根据其结果给出设计时的相关建议以便对结构进行优化。
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