This thesis primarily studies the relationship between Sinful Nature and Etiquette. In the past,thescholars asserted that "Sinful Nature" was the main thinking of Xun-Zi;however,some scholars have asserted "Etiquette" is his main thinking during this few years. This thesis tries to induce that Xun-Zi points out the "Sinful Nature" and "Etiquette" objectively. Theveful "Sinful Nature" and "Etiquette" mutually exist on the base of an objective point of view.