An electronic device and an operation method of selecting a function item are provided. The operation method is applied to an electronic device. The operation method comprises the following steps: receiving a sliding instruction of a sliding path via the touch display and displaying a first pattern on the touch display. The first pattern includes the first function item or the second function item corresponding to the sliding path. A sliding track is displayed on an outer periphery of the first pattern corresponding to a sliding distance of the sliding instruction. When the sliding track meets a predetermined path, a function corresponding to the first function item or the second function item is executed by the processing unit.