1. Two-stage compression reduces the compression ratio of each stage, reduces internal leakage, improves volumetric efficiency, reduces bearing load, and improves the life of the main engine; 2. Two-stage compression replaces single-stage compression, and the exhaust volume increases by nearly 15%, which can achieve energy saving effect of up to 15%; 3. The rotor adopts the latest design, after more than 20 processes of finishing, to ensure the accuracy, reliability and effectiveness of the rotor profile; 4. The two-stage compressor is more efficient and energy-saving, saving up to 35% compared with the twin screw air compressor. Calculated at 8000h/ set/year, it can save 200,000 electricity bills every year.