This product makes use of the water pressure in the lavatory and bathroom . By controlling the direction of the water pressure, it can get up and sit down. The discharged tap water will also be connected to the lavatory water tank or used as domestic water, so as to achieve almost no consumption. 2、If the seat surface is simply raised or lowered, the user's feet will be off the ground when the seat surface is raised, and the front edge of the seat surface will support the biceps femoris, causing discomfort to the user; When the seat surface is lowered, the front edge of the seat surface is too high to sit on. In order to solve this problem, the front edge of the seat surface is designed as a foldable structure. When the seat surface is at the lowest position, the seat surface is flat; When the seat surface rises, the front edge of the seat will slowly fold down.