Abstract: In order to utilize and study more effectively information of existing examples of large civil aircraft entities, a case base of parameterized large civil aircraft is established, and in the open conceptual aircraft design system, the examples of three-dimensional modeling are completed and related parameters are stored in the case base. Then, the method of surface parameter to the object instance is proposed. On this basis, the management of aircraft parameters in the case base and parameter analysis is realized. In addition, a new method is proposed that can form a new layout project through parts modular design and adjustment. All this lay the foundation for the quick design and preliminary analysis of new programs in the concept design stage. Finally, an instance of application examples illustrates the use of case base in the overall design phase.

Key words: aircraft design, case base, parametric model, preference, parts modular design