Shandong Liaocheng Textile Company is a leading company in textile industry in Liaocheng, with 2,000 employees. There were 3 domestic brand air compressors in the factory. Now, 3 eas of 75SFT-5.5 two-stage compression air compressors from Zhigao Machinery are used. They found that 2 air compressors even can fulfill clients their requirements. Besides, Zhigao dealer did second time energy conservation renovation – air compressor residue heat recycling, fulfilling the heating water needs of factory employees. After calculation, we found that 120 KW.H of electricity can be saved each hour, saving 800,000 RMB electricity expense annually.