The work aims to improve the use satisfaction of gardening tractor drivers by focusing on the related behaviors of drivers during the use of gardening tractors, and exploring their use requirements and transforming the requirements into design requirements of product technical characteristics. Initially, FBS-TRIZ was incorporated as the method for mapping the functional requirements of gardening tractors. By analyzing user behavior in combination with user interviews, questionnaire surveys and other methods, the user requirements were identified. FBS model was used to construct a functional requirement model for gardening tractors, with behavior used as a link between functional requirements and product structure, and the analysis was conducted to obtain method to solve design problems. Finally, TRIZ theory was applied to analyze and transform contradiction problems, and solutions were proposed for contradictions in product characteristics at the design level. The integrated application of FBS and TRIZ theory can accurately transform user requirements into design requirements at the technical characteristic level, and corresponding solutions are proposed for the deficiencies in user requirement design of gardening tractors, which provides guidance for designers to map and transform user requirements into functional structures, and verifies the effectiveness of this method.