这里提出了机械系统可靠性设计的工程计算法 ,首先考虑了系统的相关性 ,同时给出了相对误差值的简化算法理论。通过对印刷机主传动子系统的可靠性计算对该理论进行了验算 ,并得出了满意的结果。 In this paper, the engineering calculation method of mechanical system reliability design is put forward. Firstly, the system correlation is considered and the simplified algorithm theory of relative error value is given. Through the calculation of the reliability of the main drive subsystem of the printing press, the theory was checked and the satisfactory results were obtained.