Telescopic hydraulic cylinder with two or more Pistons, telescopic hydraulic cylinder piston out of order from largest to smallest, no-load retraction of the order is usually from small to large. Telescopic cylinders can be achieved long trips, and retracted length is shorter, more compact structure. This hydraulic cylinder used on construction machinery and agricultural machinery. Sing a movement of the piston, the successive movement of the piston, the output speed and output power are changing.