Abstract: In order to improve the using efficiency of gasification residue and maximize the resource utilization. Different kinds of residue generated from Texaco gasifier and GSP gasifier as objects were researched. Basing on necessary measures includes grading?analysis, determination of loss on ignition, XRD、SEM, FTIR and BET to investigate particle-size distribution, content distribution, loss on ignition as well as morphology characteristics of surface of coal particles of coarse slag and fine coarse. Results show that residual carbon content of fine slag is higher than that of coarse slag; coal particles surface in residue of two pressurized gasification units produce well-developed pore?structure, spherical molten minerals adhere to the surface of coal particles, and changing of organo-functional groups of coal particles surface is researched; minerals in residue are existed as inert materials and they are presented with random crystals; surface area of coal particles from coarse slag is higher than from fine slag.