挖掘频繁项集是数据挖掘应用中关键的问题。经典的FP-growth 算法利用FP-tree 有效的压缩了数据集的规模，但是在挖掘过程中需要反复递归构造条件FP-tree 成为限制算法效率的瓶颈。本文通过将FP-tree 映射成矩阵，通过在矩阵自身上进行伪投影得到条件模式阵，避免了递归构造FP-tree，从而节约了内存消耗和计算时间。关键词：数据挖掘；关联规则；频繁项集；矩阵Abstract: It is key point of data mining application mining frequent itemsets. Classic frequentitemsets mining algorithm FP-growth compresses the scale of dataset effectively using FP-treestructure. But it has own bottleneck that for getting complete frequent itemsets it need buildconditional FP-tree recursively in the mining process. This paper proposes a new frequent itemsets mining algorithm that maps FP-tree structure into FP-array and mines upon it. In the mining process, this algorithm can avoid building conditional FP-tree. So, it saves time and memory very much.Key words: data mining; association rule; frequent itemsets; array