The work aims to conduct demand analysis and design of Chinese herbal medicine planting assistant APP based on FBM theory. Firstly, the status and problems of present Chinese herbal medicine planting industry were analyzed through desk research and literature research. Secondly, user research methods such as questionnaire, user interview, persona and user journey map were used to analyze the user demand. After that, the pain points and demands of users were sorted out and then transformed into function points under the theoretical perspective of FBM theory. The scheme was designed based on three elements—motivation, ability and trigger. Lastly, the usability evaluation of the design was conducted by applying cognitive walkthrough. FBM behavior design philosophy is introduced into interface design of Chinese herbal medicine planting APP. It is helpful to cultivate scientific planting habits for users and improve the efficiency of interaction. It not only meets the development needs of Chinese herbal medicine planting industry, but also provides reference for design mode of similar APPs.