本文采用摄动随机有限元法，考虑了连杆外载、物性参数、形状参数的不确定性，分析其应力，并以ＰＣ２６船用柴油机连杆为例，计算了它的应力均值、方差和应力对各基本随机变量的响应敏度，与蒙特卡罗直接模拟方法相比较，摄动随机有限元法有较高的计算效率和令人满意的精度，是一种解决随机问题的有效方法。 In this paper, the perturbation stochastic finite element method is adopted, considering the uncertainties of the external load, the physical parameters and the shape parameters of the connecting rod, the stress is analyzed. Taking PC26 marine diesel engine connecting rod as an example, the stress mean value, variance and stress Compared with the Monte Carlo direct simulation method, the perturbation stochastic finite element method has higher computational efficiency and satisfactory accuracy, which is an effective method to solve stochastic problems.