The D-S evidence theory is an important information fusion method at the decision level. A novel evidence combination method is proposed to solve the counterintuitive problem of the Dempster rule. It firstly classifies the evidences according to decision making; then, constructs evidence importance degree and evidence reliability models as the discounting factors for evidences with different conflict degrees within the same class or between classes; finally, combines the evidences by the Dempster’s rule. The experimental analysis shows that the method is reasonable.