The present invention is a changeable means for different total tracks and its method, the means reflects a light from a light source at least twice toward predetermined directions; the means comprises plural reflection elements, at least one of the plural reflection elements is a rotational reflection element, which has plural reflection surface sets, and each reflection surface set has at least one reflection surface; a pivot axis is for each rotational reflection element circulation and changing of reflection surface sets; a fixing apparatus, which connects to a rotational reflection element for adjusting and fixing positions of the rotational reflection element.