Current main guidelines is to measure and generate Association rules take into account support and confidence threshold, and only in the practical application of this guideline to mining is insufficient, this is mainly because the associated rule evaluation criterion is not reasonable. This article for the associated rule evaluation conducted an in-depth study, analyzed the "support-confidence" schema limitations, presenting an interest based on correlation degree of evaluation indicators PS formula, based on its mathematical properties that has its advantages and disadvantages, laid the theoretical foundation for improvement of evaluation system of Mining Association rules.