Abstract: Coal gasification technology is the base and key of new coal chemical industry. The correct application of the technology plays a vital role in comprehensive energy efficiency of coal chemical project and running stability. According to the bed classification, this paper describes the technologies of the most widely used fixed-bed and entrained-flow bed and analyzes the characteristics and applicability of pulverized coal, coal-water slurry-flow bed gasifier，solid slag and melten slag fixed-bed gasification technologies. The future development trend of coal gasification technology and some suggestions for technology choice are suggested.