In view of the problems such as lack of elderly mobility tools and disordered design, the work aims to put forward relevant comprehensive design from the elderly mobility scooter by paying attention to aesthetic deficiency in modeling design and considering the demand for product functionality. The perceptual vocabulary of the mobility scooter was determined through data collection and market research and the modeling characteristic elements were analyzed. Combined with analytic hierarchy process, the evaluation system of modeling design elements was established, and the modeling elements meeting users' perceptual needs were obtained through questionnaire survey. Taking this as the main body, the relationship between modeling elements and functions was analyzed with SAFC model, and the structural presentation of functional attributes was conducted, and innovative design was carried out by the theory of conflict resolution. The modeling of the mobility scooter was designed based on perceptual needs and reasonable functional solutions were obtained. A product innovation design process integrating perceptual engineering, hierarchical analysis and SAFC theory is constructed, and the design practice and evaluation show the feasibility of this method.