Aiming at the problem of fatigue driving, this paper conducts research and evaluation on the interactive design of fatigue early warning products according to the demand of users, and proposes design methods to improve the user experience of related products. First of all, the framework of the interactive design system for in-vehicle fatigue early warning products is established.Through user interviews, questionnaire surveys, etc., the user's demand for in-vehicle fatigue early warning products is summarized, and a hierarchical analysis model of user demand is established. Secondly, the AHP is used to collect the scores of experts and users, and then calculate the weight of the indexes to obtain the priority of each demand.Based on the demand priority, the interactive design of the in-vehicle fatigue early warning product is carried out. Finally, FCA is used to evaluate and optimize the design.The design example verifies the effectiveness of the AHP-FCA design strategy. At the same time, this method can help designers explore the interactive design direction of in-vehicle fatigue early warning products, improve users' experience, and expand the ideas for the interactive design of related products.