Abstract: In order to achieve the high efficient and upgrading utilization of low-rank coal,the thermal extraction oil and high specific surface area activated carbon were prepared by mild supercritical thermal extraction coupled with carbonization technology using Datong coal.The activated carbon were analyzed by scanning electron microscope( SEM),X-ray diffraction( XRD) and Fourier transform infrared spectroscopy( FT-IR).The adsorption properties were tested by methylene blue.The results show that thermal extraction rate of coal reaches 26.23%,and carbon material yield of thermal extraction residue and Datong coal are 45.95% and 46.87% respectively.The maximum adsorption amount of thermal extraction residue based carbon material reaches 1 340 mg/g,and the removal rate of methylene blue reaches95.7%,while,maximum adsorption amount of Datong raw coal based carbon material is only 1 040 mg/g,and the removal rate of methylene blue is 74.3%.It is found that Datong coal not only produces a certain number of thermal extraction oil,but the thermal extraction residue is also converted into high specific surface area activated carbon under the condition of mild-low-temperature activation. The adsorption properties of the activated carbon on methylene blue are better than common active carbon.