Abstract: With the rise of coal chemical technology,the resource treatment of coal gasification fly ash has become an urgent problem.The gasification fly ash from commercial fluidized bed gasifier was tested on 15 kg/h modified gasification test rig to study the effects of fluidization modification on the morphological properties and ash fusibility of gasification fly ash and the regasification characters of modified fly ash. The results show that the regasification of gasification fly ash at 1 200 ℃ can be achieved by fluidized modification. After the fluidized modification,the total pore volume and specific surface area of fly ash are improved because the crack and gasification reactions of residual carbon have the effect of cleaning and promoting the formation of pores. The pore characteristics of modified fly ash can be further improved with the increase of steam and oxygen concentration of modification gasifying agent. On the other hand,after the fluidized modification of gasification fly ash,due to the transformation of high melting point component of the ash minerals into anhydrite with low melting point,the ash fusion temperatures of gasification fly ash decrease,the viscosity-temperature curve becomes smoother and the temperature of critical viscosity reduces. Compared with the fluidized modification at 900 ℃,the modified fly ash is obviously gasified by water gas reaction in the down-flow gasifier at 1 200 ℃,and the yield of effective gas CO+H_2 increases to 0.29 m~3/kg and the system carbon conversion increases to 71.2%.