Objective: In order to prevent health problems caused by excessive sugar intake, a smart water cup which can detect the sugar content of drinks is designed to remind users to take in sugar reasonably every day and meet their life needs of reasonable sugar control. Methods: Firstly, KJ method was used to arrange and sort the demand hierarchically, and then Kano model was used to sort out the demand of sugar control population, so as to clarify the multiple demands of users' age or health status for products. Secondly, the existing liquid sugar detection technology is analyzed, and the feasibility and application mode of infrared spectroscopy in water cup are discussed. Results: Based on the demand of sugar control and interaction mode, the water cup design scheme was obtained, and the rationality of the structure and function of the model was evaluated, and the design was optimized. Conclusion: according to customer demand for control of sugar, sugar measuring cup with existing technology, can users daily drink for drink sugar content were detected and timely warning, by means of visual reminder to prevent from eating too much sugar the damage to health of users, at the same time design case for daily liquid sugar testing research provides effective empirical reference.