The walls and ceiling around the generator room are made of ultra-fine glass wool sound-absorbing felt, and the outer side is provided with micro perforated galvanized sheet. The sound absorption method is as follows: the angle iron is used as the keel, the angle iron mesh is 500 × 500 mm, the surface protection is carried out with galvanized sheet with thickness of 0.8 mm and perforation rate of more than 20%, the protective plate is covered with ultra-fine glass wool with volume density of 25 kg / m3 and thickness of 50 mm, and the outer wall is covered with glass fiber cloth and galvanized wire mesh. (2) the exhaust gas of generator is installed with two-stage muffler. Double mufflers and exhaust louvers are installed at the inlet and outlet of the engine room. The muffler is 2.8m long. Exhaust chamber is set behind exhaust fan and generator exhaust fan. Double layer muffler is installed from bottom to top in stainless steel muffler price room. The first stage muffler and the second stage muffler are respectively installed in the exhaust pipe of the generator set. The first stage muffler is self-contained in the generator set, and the second stage muffler adopts impedance composite muffler, with the noise reduction capacity greater than 20dB (a). (3) The door body is double-layer 1.2 mm A3 steel plate composite structure, and the stainless steel muffler model adopts ultra-fine glass wool (20kg / m3) sound absorption. The specification of the door body is 2000 × 1000 × 100 mm double door.