Abstract: The research introduced the main sources and hazards of coal gasification slag and the physical and chemical properties of coal chemical gasification slag, and discussed status of slag generated by different coal gasification processes(including fixed bed, fluidized bed and entrained flow bed),further discussed the utilization status of coal gasification slag in boiler blending, cement and concrete filler, brick making, adsorption, industrial materials and agriculture and outlooks the application prospects of coal gasification slag. At present, the utilization rate of coal gasification slag is low, the carbon and ash are mutually restricted, boiler blending and the constmction materials are the main utilization way, and the high value utilization is mostly in the laboratory research stage. Boiler blending is the main way to solve the coal gasification slag locally, because of high moisture, low carbon residue and insufficient calorific value, so in practical application need to consider economic benefits and impact on the stability of boiler system.Construction materials is the scale of coal gasification slag elimination path, but the high burn loss of coal gasification slag has exceeded national and industry standards, the residual carbon is inert substance which affects the quality of cement and concrete and bricks.Adsorption in the field of actual engineering may exist water secondary pollution, production technology complexity and high investment risk which still need to be further optimized with the actual production design and test.The preparation of catalyst carrier, rubber and plastic filler, carbon and silicon composites, polyaluminium chloride, ceramic material and other industrial materials is the current research hotspots, with high value-added products, but the high cost and complex process, mostly in the laboratory research stage and need to develop feasible industrial routes to further expand the high-value resource utilization of coal gasification slag and provide technical support for its high-value utilization.The use of coal gasification slag for sand improvement, compost additive and heavy metal degradation has been flourishing, but the risk of heavy metals in coal gasification slag to the environment still needs in-depth research. In order to improve the economic efficiency of enterprises and solve the environmental problems of coal gasification slag, in view of the current situation of coal gasification slag piling and landfill, based on the characteristics of large production of coal gasification slag, abundant carbon aluminum silicon resources, large specific surface area and well-developed pore structure, it is suggested that coal gasification slag grade utilization, and gradually develop simple, feasible and economic benefits of the gasification slag ash separation and utilization technology, moderate development of gasification slag in the ecological field of application, to achieve the harmlessness, reduction and resource of coal gosification slag.