Regular prism plane display method and device

The invention discloses a regular prism plane display method. The method comprises steps: an instruction of displaying a plane graph of a regular prism at any initial state is received; plane coordinates of each vertex of the bottom surface are obtained; two bottom surface vertexes with the maximal absolute value of X coordinate differences are obtained via calculation, and the bottom surface vertexes serve as reference vertexes; all bottom surface vertexes whose Y vertex values are greater than those of the two reference vertexes are obtained via calculation, and the bottom surface vertexes serve as virtual vertexes; the edge of a regular prism at the initial state with at least one of all virtual vertexes to be one of end points is displayed to be a virtual line; a graph rotation instruction is received; and according to the graph rotation instruction, a regular prism plane graph after rotating around the axis for a certain angle is displayed. The invention also provides a regular prism plane display device. According to the regular prism plane display method and the device, a function of carrying out further transformation operation on the regular prism plane graph can be realized, a teaching process by a teacher is better assisted, and user experience is enhanced.