In architectural design of a small or medium-sized scale project, various competition forms came to be adopted and the designer selection have greatly changed in recent years. The resident participation form is also transfigured to the creative participation. Designers need to explain the design intention to the resident or the parties concerned for understanding. Therefore, it needs a new method to represent the design idea, intention, and design proposal etc., both to the designers and the resident. By analysis of the designer's creative thinking in the planning stage of architectural design, we proposed a design creation model for design obeject modeling. It aims to provide a design support method for the conceptual stage of architectural design. This paper focus the discussion on design object modeling and representation. We also verify the effectiveness of the proposed model through an application example.