It introduces the concept of the KJ method, and analyzes the interactive design of the taxi about APP to obtain the better user experience. It expounds the steps of KJ method in the research of interactive design, that is, theme determination, information collection, paper making, marshalling and classification, and determining scheme. Taking the interactive experience of one complete stroke in the APP as an example, the 3 levels of visual interface, interaction flow and technical function are analyzed based on the method of KJ.The existing problems of UI design, such as non-standard design, confusion of interactive logic, various functions, unclear expression of text and unknown interactive ideographic, are also given.