Abstract: A flush control device for toilet comprises a water discharging member, a control member and a stepped check member disposed at their relative position in a water tank. The stepped check member is composed of a plurality of damper plates in different size and co-axially engaged in a lug means adjacent a water outlet. The damper plates each has a first shoulder of different heights at their front sides toward a outlet valve. So that the damper plates rotate in accordance with the variation of the water level in the tank to check the outlet valve to open a different span so as to discharge a selective amount of flush water into a toilet bowl.