On the basis of the advanced first order and second moment method, the partial derivatives of the failure probability to the distribution parameters of the process variables were formulated.

由求解失效概率的改进一次二阶矩法出发，给出了失效概率对中间变量分布参数偏导数的计算公式；

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Reliability analysis using First Order Second Moment (FOSM) is important for structural probability design, in which process demands the derivative operation.

一次二阶矩法是目前求解结构可靠性分析的主要计算方法之一，该方法要求功能函数对随机变量的偏导运算。

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