最小环最小集(SSSR)是环系的重要特征之一。本文提出一种基于生成树、弦和路径长度的环系最小环最小集识别方法,不需事先进行环系识别。由于采用以分枝节点和枝为基本单元的树图表示,降低了树图的复杂度,并且识别过程只需在图上搜索一次,大大加快了识别过程。给出了2个包含复杂环系的化学结构作为最小环最小集识别的例子。 Minimum ring minimum set (SSSR) is one of the important features of the ring system. In this paper, we propose a minimum ring minimum set identification method based on spanning tree, chord and path length, without prior ring system identification. Due to adopting the tree diagram with branch nodes and branches as the basic units, the complexity of the tree diagram is reduced, and the recognition process only needs to search once in the graph, greatly speeding up the recognition process. Two chemical structures containing complex ring systems are given as examples of minimum ring minimum set identification.