Abstract: Fine slag from gasification is a coal-based solid waste product,which is precipitated by black water after the coarse gas at the outlet of entrained flow gasifier is washed. There is no large-scale resource disposal plan. In order to develop efficient decarbonization technology of fine slag from gasification,the chemical composition,particle size,micro morphology,pore structure,particle size,pore size and pore size of three kinds of entrained bed coal gasification fine ash (DSG,HL,SH) in Northwest China were analyzed by using laser granulometer,elemental analyzer,scanning electron microscope and energy spectrometer,X-ray diffractometer,X-ray fluorescence spectrometer,BET specific surface area analyzer,thermogravimetric analyzer and other analysis equipment. The results show that the moisture content of gasification fine ash is higher than 40% and the calorific value is lower than 10 MJ/kg. The poor pore structure and the existence of molten slag layer on the surface lead to the low reactivity of fine slag from gasification. In thermogravimetric analysis,the weight loss rates of DSG,HL and SH are 13%,29% and 17%,respectively. Compared with the original residual carbon of 16%,37% and 48% in the three kinds of fine slag from gasification,the residual carbon consumptions of DSG,HL and SH are 81%,78% and 35%,respectively.When the oxygen concentration increases from 21% to 30%,the sample reactivity is improved to a certain extent. At present,the conventional combustion decarburization technology cannot realize the efficient decarburization of fine slag from gasification. Therefore,the new combustion decarburization technology should be developed to provide support for the resource utilization of fine slag from gasification.