With JH coal as raw material，deashed coal was produced by using the method of two steps of hydrochloric acid-hydrofluoric acid.The effect of reaction conditions on the properties of deashing coal was investigated by single factor method.Through industrial analysis，element analysis，infrared spectrum analysis and gieseler fluidity，the changes of physicochemical properties of JH coal before and after acid cleaning and deashing are analyzed.The results show that the demineralization can reduce the ash content in coal down to 0.51%; the deashing has little effect on the aliphatic hydrocarbon compounds in coal，but has great influence on the aromatic hydrocarbon compounds and the oxygen-containing functional groups; It is also found that under N2 shielded，the deashing has an influence on the fluidity rather than the caking property of coal.