The work aims to design a diagnosis and treatment chair that can effectively improve the bad mood in the diagnosis and treatment process and relieve children's dental fear, to optimize children's medical experience and improve the diagnosis and treatment efficiency. A product design model integrating KANO, AHP and AD theories was proposed and applied to the design of children's dental chairs. Firstly, KANO was used to divide the attributes of children's diagnosis and treatment needs; Secondly, AHP was integrated to build a hierarchical model of user needs, and the weight coefficients of each level were calculated. It was clear that the relatively important user needs were emotion communication, reducing external interference, time reminder, popular science treatment process, and interesting experience; Thirdly, the independence axiom of AD was applied to complete the mapping of demand domain (CA), function domain (FRs) and design domain (DPs) of children's dental chairs, and the rationality was judged by the matrix to obtain the optimal solution; Finally, VR equipment and a CFSS-DF evaluation form were used to evaluate the effectiveness of the design scheme. The KANO, AHP and AD theoretical models were used to design a dental chair that could improve children's medical experience. According to the design evaluation results, the design process can effectively guide product development, further verify the scientific nature of the design process, and at the same time, the process can provide scientific and reasonable new ideas for the development of similar products.