I. Introduction
In recent years, data mining based on privacy preserving has become a hot spot of database study. Association rules are researched popularly too. Association rule mining is to find the interesting relationship and interrelationship of item sets among the mass data. The privacy preserving of association rule is an operation done to hide the sensitive rules aimed to frustrate the data user's attempt to mine the data from its owner before the process of association rule mining. To implement the privacy preserving of data, we need to consider the follow two points: One is how to ensure the privacy not to be revealed during data application process. Another is how to make it better for data application. At present, the study of privacy preserving is concentrated on how to design a better algorithm while balance the two points mentioned above[2].