With the problem of vast data information in the life,people usually simplify the data for eliminating the redundant part by the rough set. But most studies did not consider the effect of reduction on the original classification. The naive Bayesian method is hard to obtain the prior probability. Based on the above problems,a method of Bayesian network based on the rough set is proposed in this paper. Firstly,we reduce the attribution for eliminating the redundant data by the dependencies between decision at...