Based on the analysis of the loads of pneumatic duct system, constraints of aircraft structure and its mechanisms applying to the duct system, the finite element model of the pneumatic duct system in a certain aircraft was developed and static analysis was carried out by means of finite element method. Using the Von Mises criterion, stress safety evaluation was established according to the stress results. Meanwhile, effects of ball joint property on the stress performances of the duct system were also investigated. The results of the study show that stress compensation effect will be improved by the bigger maximum bending angle and the smaller starting moment.%在详细分析空气导管所受到的载荷、飞机结构的约束及其对管系作用机制的基础上，以某型飞机空气导管为例，采用有限元分析方法，对管系进行应力分析，并据此基于米塞斯校核标准对管系进行应力安全性评估。同时，考察了球形接头的特性参数对管系应力集中程度的影响。研究结果表明：球形接头的补偿效果随着最大转动角度的增大而增大，随着起动力矩的增大而减小。
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