The work aims to improve user cognition satisfaction in product use, and improve the clarity and effectiveness of the mapping relationship between user cognition and product. Starting from the perspective of user cognition, cognitive task analysis methods and structural equation models were integrated in combination with information processing models to deconstruct the mapping relationship between user cognition and product experience, and construct a product design methodology process from the perspective of user cognition. Taking the mobility scooter for the elderly as the design research object, firstly, the cognitive task analysis method was used to clarify the design analysis process of "cognitive task-cognitive path - design elements-product experience"; secondly, the structural equation model was introduced to determine the weights of the design elements of the mobility scooter, and to identify the key design elements of different product experience elements; finally, the design decision-making process was carried out by combining the needs of the user population with the information processing model. Design decisions and program refinement are made by combining the needs of the user population. In conclusion, this method can identify the most important user cognition touch points, reduce the "black box" of user cognition in the design process, and help designers to determine the constructive path between user cognition and product experience. It provides designers with a clear design basis in specific practice activities, and enriches the practice research of cognitive psychology in the field of design.