Graph theory is introduced to model the problem of frequent pattern mining over data stream. The equal weight clique is proposed in this paper. The problem of mining max frequent pattern is transformed into the problem of solving max equal weight clique. A max frequent pattern mining algorithm EWCFPM which based on equal weight clique is proposed in this paper. In order to decease the processing time, we design pruning strategy. The IBM synthesizes data generation which output customers shopping a data are adopted as experiment data. The EWCFPM...