In response to the lack of interactivity and guidance of handwashing products for kindergartens in the current domestic market, the work aims to design and study a smart handwashing machine for kindergarten to help guide children to develop good handwashing habits and take better care of their health. Firstly, the product opportunity gap was clarified by analyzing the SET factors. Secondly, the user research was carried out to obtain the user demand points. The entropy method was used to correct the data obtained by the hierarchical analysis method (AHP) to obtain comprehensive weighting values and to rank the importance of user demands to clarify the product value opportunity. Thirdly, based on the product value opportunity, the product concept was formed and the design concept matrix was drawn. Finally, the concept was transformed into a design scheme and a prototype model was produced to test the validity of the design.The smart handwashing machines for kindergartens under the guidance of INPD and entropy method have the feasibility. The INPD method improves the efficiency and market success rate of product development, while the combination of the hierarchical analysis method (AHP) and the entropy method improves the process of extracting important user demands, making the whole design process of the kindergarten handwashing machines more scientific, systematic and rational.