As a powerful tool in dealing with uncertainty questions,the evidence using in the evidence theory is given by experts.The expert's knowledge is limited,subjective and sometimes difficult to obtain.To solve these problems,this paper proposes a new method of knowledge acquirement and presents a method of evidence combination and application.Firstly,we research the problem of how to partition the huge decision table.By analysing of the dependency degree among the attributes based on the Rough Sets(RS),conditi...