This study has designing the model that uses case-based reasoning (CBR) in order to use materials model and cost mode in management application. It intends to improve system effect through expression the method for case, the method for retrieving materials model and cost model, the method for materials model, and cost modeling procedure through case-based reasoning then it ultimately aims at improving the productivity of design. The past similar cases and related modifying rules that are offered from case-based reasoning using materials model and cost model could replace an appropriate role of guideline that users give in the process of materials and cost modeling