Pattern-based clustering has been studied intensively in recent years. This kind of clustering model focuses on the similarity between patterns. Such clusters are important for some applications, e.g. DNA microarray and E-commerce. An example of pattern-based clustering models is called pCluster. In this study we propose a new approach to find the pCluster. Our approach utilizes the Apriori algorithm, which is a well known algorithm in the data mining field. We can find every pCluster by using our approach.