Apriori算法是一种挖掘关联规则的频繁项集算法，其核心思想是通过候选集生成和情节的向下封闭检测两个阶段来挖掘频繁项集。而且算法已经被广泛的应用到商业、网络安全等各个领域。-Apriori algorithm for mining association rules of frequent item sets algorithm, its core idea is to mining frequent itemsets detection candidate set generation and plot closed down two stages. And the algorithm has been widely applied to commercial, network security and other fields.