Coal gasification technology is the key technology of environment-friendly modern coal chemical industry.The article introduces the primary coal gasification technologies in the current world with emphasis on commercially-used gasification furnaces of Lurgi,Transport,Shell,Texaco,ConocoPhillips,and China's furnaces developed by the technology of East China University of Science Technology of its own.The paper also introduces the application of coal gasification technology in IGCC and coal chemical industry of synthetic oil,synthetic ammonia,synthetic methanol,and synthetic olefin,emphatically introducing the specific condition of coal chemical industry development in China.