The work aims to design a retractable dining table with an adjustable area to enrich the application scenarios of the dining table, improve the working principle of the traditional dining table and expand its use functions, and meet the diverse demands of contemporary people. The research and interview methods were used to summarize the categories of user demands, and the AHP method was adopted to calculate the weight of each user's demands. QFD was used to transform user demands into technical demands, and obtain contradictions. The separation principle and contradiction matrix of TRIZ innovation theory were used to find out the best way to solve technical and physical contradictions from 40 invention principles, and finally get the ideal solution. By integrating theoretical models such as AHP, QFD, TRIZ, etc., and applying these models to the design and development process of the retractable dining table, a retractable dining table was designed, which further verified the scientificity and rationality of this set of design processes. This set of design processes is able to provide reference ideas for product design and development.