To reduce the noise radiated by compressor in a refrigerator, a new noise suppression technology is presented, i.e. the invention of compressor acoustically constrained by hoops with damping layers. By improving the inner damping and positively changing the vibrational modes of compressor shell, it converts energy of vibration into heat energy and then reduces noise radiation. So it can not only improve the ability to reduce low frequency noise, but also successfully solve the problem of heat emission of compressor which usually can not be avoided with other traditional methods of sound insulation. The sound absorption guiding cone is made of foam material, which can reduce the secondary noise and guide the flow. The principle of noise reduction, structure of the innovative compressor and sound absorption guiding cone are introduced and analyzed in the article. The experimental results show that the hoops with damping layers reduce the noise without influencing obviously the refrigeration performance.