A method for setting function options and a multi function peripheral (MFP) using the same are provided. The MFP at least includes an image sensor and an option switch, wherein the option switch includes a sliding groove and a shift lever, and the shift lever is disposed in sliding way in the sliding groove. The method includes using the image sensor to obtain an option image of the option switch; judging a corresponding position relating to the shift lever in the option image; and setting a peripheral function according to a function option corresponding to the corresponding position.