An operation method of an operating system, applied to an electronic device. The electronic device includes a touchpad and a screen. The touchpad has a first edge. The electronic device is used for executing the operating system. The screen is used for displaying a display image outputted by the operating system. A cursor is displayed at the display image. The operation method of the operating system comprises: determining whether a touch operation is a sliding gesture sliding from an edge when the touchpad senses the touch operation; determining which edge of the touchpad is sliding from by the sliding gesture if the touch operation is the sliding gesture sliding from the edge; displaying a charm bar in a first area of the display image and displaying the cursor on the charm bar if the sliding gesture slides from the first edge.