In order to provide a design innovation process based on logic, it was studies how to use TRlZ theory and tools in industrial design. According to the concept of innovation level in TRIZ, the level of difficulty of industrial design was pointed out. By using the previous findings of comparative study about the conflict theory, the separation principle, the principle of invention, TRlZ, ideality. substance field analysis and the effect library and other tools in TRIZ, the applicability of these tools in industrial design was analyzed. Then an industrial design innovation process model was set up by combining TRIZ conceptual design process with general industrial design process. At last, the model was used to design the shape and transformation mechanism of a kind of multifunctional desks and chairs, also its validity was verified.