Using F-AHP (Fuzzy Comprehensive Evaluation Method and Analytic Hierarchy Process, F-AHP) to comprehensively analyze and evaluate the sitting and lying dual-purpose office chairs, so as to design products that meet the actual needs of users. Through the analytic hierarchy process, the vague concept of user’s subjective feeling was quantitatively and qualitatively, and product usability was regarded as an important indicator of evaluation. Based on the results of the questionnaire, it was classified into four aspects:convenience, comfort, avant-garde, and scientificity. , Build an analytic hierarchy system, finally calculate the weight of each design evaluation index by collecting the scores of experts and users, and use the fuzzy comprehensive evaluation method to analyze and evaluate the design plan of the office chair to get the best design plan, and finally use JACK The software creates a digital character model to analyze the test results of force comfort.Through the application of analytic hierarchy process and fuzzy comprehensive evaluation method to the product design process, the project of sitting and lying dual-purpose office chairs designed according to the user's needs under different working conditions has certain reference value. Through the design case of the sitting and lying dual-purpose office chair, it is scientifically and comprehensively confirmed that the combined use of the analytic hierarchy process and the fuzzy comprehensive evaluation method is practical and reliable in the product design process, and can effectively guide the office chair. Innovative design process.