The work aims to design a sleep aid for the youth user group by applying the relevant research methods of Kansei engineering and TRIZ, in order to solve the problem of insufficient attention to the emotional needs of the youth user group in the current market. Firstly, the innovative design process of sleep aid based on Kansei engineering and TRIZ theory was constructed, the perceptual vocabulary and samples were collected and screened, and the Kansei engineering was used to construct the judgment matrix of design elements and perceptual images of sleep aid. Secondly, the principal component analysis was used to reduce the dimensionality of the data, determine the main factors affecting the perceptual judgment of the sleep aid and analyze the samples to get the characteristics of the design needs to be met. Finally, the conflict theory was adopted to carry out the innovative design of the sleep aid device. Under the guidance of innovative design process, a sleep aid that met users' perceptual needs was developed scientifically and efficiently. The example of innovative design of sleep aid shows that the application of Kansei engineering and TRIZ can effectively transform users' emotional needs into design elements, and can carry out innovative design that meets the needs of target users. At the same time, the design process can provide ideas and methods for innovative design of related products.