Abstract: Aiming at the problem that the existing method of component matching of CNC system can not meet the needs of the user's component matching,description logic is used to describe the request of component and provide of component.Based on the classification of the components,a method of component matching based on description logic is presented.Finally,an example shows that the proposed method can effectively help users to select components.

Key words: description logic, CNC system, component matching, mismatching degree