Embodiments provide a terminal device control method and a terminal device. The method includes: when a bending behavior of a flexible display occurs, determining a bending parameter of the flexible display, where the bending parameter includes at least one of a bending time parameter, a bending location parameter, a bending direction parameter, and a bending degree parameter; and adjusting a user interface (UI) of the flexible display based on the bending parameter, or generating, based on the bending parameter, a command corresponding to a first application. According to the method provided in the embodiments, the bending behavior of the flexible display is abstracted as the bending parameter, and the bending parameter is used as input of the application. This manner can effectively improve user experience.