The work aims to propose the innovative design model of TRIZ theory and FBS model to make full use of their respective characteristics in product innovation design to form a complementary advantage, and design a new stretcher based on this model to replace ambulances through narrow roads for rescue. Based on the existing stretchers in the market, the FBS model was used to explore the user needs of medical personnel and injured people, and the user behavior was derived from the user needs, and then the innovative structural features of the stretcher were obtained. After that, TRIZ theory was applied to analyze the conflicts in the structure and function design of the stretcher, find the solution to the problem and form a plan. According to the product innovation design model, a new stretcher with autonomous power system was designed, which could quickly transfer the injured, carry a certain amount of rescue supplies, and pass through a small space and carry more than one person. The product innovation design model integrating TRIZ theory and FBS model provides a systematic and effective design thinking and tools for exploring and solving problems in the product innovation design process.