The loop-sum theory of network is used to reform the model and algorithm of the tree-based method, and the improved algorithm lowers the calculation complexity and increases the accuracy and maneuverability of valuation.

• 为简化复杂系统可靠性评估计算复杂性、准确得到可靠性评估数据 ；利用网络图的环和运算 ；改进了基于生成树方法中的模型与算法 .；改进后的算法降低了计算复杂性；提高了评估过程的准确性、可操作性