Abstract: A method of surface treatment on the surface of a metal object includes a step of preparing multiple releasing sheets, each releasing sheet having at least one hollowed pattern; a step of attaching the releasing sheet on the metal object and the hollow patterns of the releasing sheets forming a figure; a step of grinding the surface of the metal object, the sandwheel removing material on the surface of the metal object via the hollowed pattern; a step of moving the releasing sheet, and a step of repeating the steps 2 to 4. The releasing sheet attached to the surface of the metal object of each of the repeated steps is different from the previous one. The sandwheels for grinding the metal object corresponding to the different releasing sheets have different roughness to obtain the figure. The metal object has an obvious figure and does not pollute the environment.