Abstract: In order to study the effect of coal water slurry(CWS) concentration and pyrolysis temperature on the formation of pyrolysis gas and the structure of coal char,the rapid pyrolysis of Inner Mongolia bituminous coal and coal water slurry with different concentrations(55%,60%and 65%) was tested at different temperatures(800,900 and 1 000℃),the change law of pyrolysis gas of coal water slurry with pyrolysis temperature and coal water slurry concentration was investigated,and the microcrystalline structure changes of coal char after pyrolysis of coal water slurry and coal powder were analyzed by XRD and Raman.The results show that under the constant concentration of coal water slurry,the production of CO,CH_4,CO_2,H_2,HCN and NH_3 gradually increases with the increase of temperature,and the production of HCN is much higher than that of NH_3.At a constant temperature,with the increase of the raw coal concentration in the coal water slurry,the production of CO and CH_4 gradually increases,while the production of CO_2,H_2,HCN and NH_3 gradually decreases.The results of XRD show that with the increase of pyrolysis temperature and the increase of water content in coal water slurry,the d_(002)of coal char of coal water slurry gradually decreases,and the L_cgradually increases.The results of Raman show that with the increase of pyrolysis temperature and the increase of water concentration,A_(D1)/A_G and A_(D3)/A_G gradually decrease,while A_G/A_(all)gradually increases.These show that the degree of ordering of the carbon microcrystal structure in coal char gradually increases with the increase of pyrolysis temperature and water concentration,and the graphitization degree of coal char increases.The correlation analysis between Raman and XRD shows that during the pyrolysis of coal water slurry,d_(002) is positively correlated with A_(D1)/A_G and L_c is positively correlated with A_G/A_(all)with the change of pyrolysis temperature and coal water slurry concentration.