Abstract: This invention discloses a piston set and a compressor thereof. The piston set is disposed in a cylinder of a compressor and comprises a piston and two piston rings. The piston is a rod-shaped structure installed in a ring-shaped groove close to the periphery of both ends of the piston. At least one interference element is formed at the bottom surface of each of the grooves. The two piston rings are installed in the grooves of the piston and being tilted by the interference element respectively. By such arrangements, the invention can improve the air tightness and cooling capacity of the compressor.