Two control-levers of toilet water flush system provides two control-levers to control the amount of flush water. User presses downward one control-lever to flush small amount of water enough to flush liquid human waste and then releases it to shut off water. User presses downward another control-lever to flush a large amount of water to flush solid human waste. One person urinates a couple of time a day and only defecate once a day. If we use only small amount of water to flush urine then we can save a large amount of water to relieve the shortage of water supply in big cities in the United States.