Benefiting from the development of display technology and intelligent materials, the carriers of information dissemination are becoming more and more abundant. The form of the user interface is gradually endowed with the possibility of various forms such as folding and deforming from the static plane display. The medium through which users acquire information also extends from two-dimensional space to multidimensional space. The above changes put forward new problems and requirements for design expression and user experience research. Through literature research, case studies, comparative analysis and the method of design practice, this paper summarizes the morphological characteristics of flexible display technology driven by user interface, and analyzes the problems faced in the design of the flexible display interface. Design suggestions and strategies are discussed through design examples from three aspects of information dimension, interface presentation and interaction behavior. Then, the application scenarios and design possibilities of flexible user interface in the future are discussed from the perspectives of the integration of information and physical space and ecological intelligence feedback.