Abstract: Coal gasification is the key technology for clean and high-efficiency coal utilization. It also is the basis of process industry for coal-based chemicals synthesis（such as ammonia，methanol，acetic acid，olefin etc.），advanced Intergrated Gasification Combined Cycle（IGCC）system，poly-cogeneration，hydrogen production，fuel cell and direct-reduction iron making. It is very important to research and develop large-scale coal gasification technology. In this paper，the status of the development of over-sea large-scale coal gasification technology is summarized. And that of research and commercialization of large-scale coal gasification in China is also been introduced. The development trend of and technical approach to commercialization of coal gasification are analyzed.