采用布尔代数化简法求出系统的最小径集，给出了事故树中基本事件的结构重要度分析结果。
The minimal path sets (MPS) are achieved by Boolean algebraic simplification calculation. The authors put forward the analyzing result of the structural significance of the basic event.
新的模糊重要度计算方法解决了中值法中最小割集所含基本事件模糊重要度相同的问题， 考虑了基本事件发生概率的不同对系统顶事件的影响。
The new fuzzy importance calculating method solved the problem of median method that the basic events in minimum cut sets have the same fuzzy importance degree.
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