This paper presents the directed itemsets graph to store the information of frequent itemsets of transaction databases , and puts forward the trifurcate linked list storage structure of directed itemsets graph , and provides the mining algorithm of frequent closed itemsets based on directed itemsets graph 摘要利用了有向项集图来存储事务数据库中有关频繁项集的信息，提出了有向项集图的三叉链表式存储结构和在于有向项集图的频繁闭项集挖掘算法。
