The work aims to improve the elderly-orientation degree of intelligent bathroom products and increase the satisfaction of elderly users. Kano model and QFD quality function deployment were integrated to assist design decision-making supplemented by human-machine research and user behavior state analysis. The questionnaire survey method was used to mine the user needs. The importance of the obtained user needs was quantified and corrected to assist in the construction of QFD house of quality of elderly-oriented bathroom products. Combined with the auxiliary method, the design example of elderly-oriented bathroom products was finally completed. Finally, JACK simulation analysis was conducted to verify and analyze the man-machine comfort of the output scheme. Through the Kano QFD Model, and in combination with the design idea of the auxiliary method, the user needs can be positioned more accurately. The output scheme was highly suitable for the elderly and had a great effect on improving user satisfaction. The method of integrating Kano QFD Model and man-machine data and behavior state analysis aided design is put forward, which has a certain reference value for the optimization of elderly-oriented design process and the actual output of intelligent bathroom products.