Introduce the computer-assisted molding process system in composite components knowledge base. The feature reasoning based method is applied to the composite molding process retrieval in the light of the issues of large number of parameters, hard management and the little probability of experience sharing. Besides the production rules based reasoning approach is proposed to decide the composite materials molding technology. The overall design structure, including database of materials management, molding instance process, molding parameters management and secondary molding process selection are demonstrated. We take the object and component oriented technology to realize the design.