The invention provides a system for regulating an angle of a display. The system comprises a display rotating module, an image shooting module for shooting a face image, an image data processing module for processing data of the face image, and a control module for controlling the display rotating module and the image shooting module. In the system for regulating the angle of the display, the image shooting module is used for shooting the face image, and the angle of the display can be regulated according to the face image under the control of the control module, so frequent manual operation can be avoided. The invention also discloses a using method of the system for regulating the angle of the display.