从推导与分布类型无关的可靠度下限引出概率设计方程 ,通过概率设计方程可实现用传统设计方法解决可靠性设计问题。为建立概率设计方程绘制了可靠度下限和安全系数间的关系曲线Rmin -n 。通过实例说明了用概率设计方程解决可靠性设计问题的方法 Probability design equations are derived from deriving the lower bound of reliability that has nothing to do with the distribution type, and the reliability design problem can be solved by the traditional design method through the probability design equation. To establish the probability design equation, the relationship between the lower limit of reliability and the safety factor is plotted as Rmin -n. An example is given to illustrate how to solve the reliability design problem by using the probability design equation