The essence of the design is the most important issue in the design science, and the Constituent Theory is put forward to explore the nature of the design. The Constituent Theory is based on the way of existence of the world; some basic concepts of the Constituent Theory are put forward in this paper; based on the Constituent Theory, some basic concepts in the design are redefined. and the nature of the design is explored; a design process model is established, namely, the Design Driving-Design Implied-Design Matching model (DIM model). The three types of the Constituent relationship sources are obtained by the Design Driving; the Constituent relationship models are obtained through the Design Implied; the specific Constituent relationships are obtained through the Design Matching, and then further improvement is obtained through the sub-DIM model. Finally, the design example for escaping from the H-Bahn is used to verify the validity of the Constituent Theory. Thus, the conceptual foundations and the design process model of the Constituent Theory are established,with a clear nature of the design and new perspectives and ideas for the design.

design science  /  nature of design  /  the Constituent Theory  /  constituent  /  constituent relation