Desig n catalogue is a kind of information management system supporting scheme design statically and dynamically. Design catalogue is for the f irst t ime t ransplanted to the g un scheme desig n process by discussing its concept and application, and by joint ing the guncfeatures in this paper. T he primary know ledge catalog ues, mechanical know ledge catalogues and funct ional know ledge catalogues are analyzed by its layer st ructure, and the evaluat ion model is set up by using fuzzy mathemat ics theory, the excellent scheme is established by the evaluation model, and the computer ex pression methods of gun scheme desig n catalogue are described in the end of the paper.