Abstract: In order to realize the utilization of the lignite with high additional value and further understand the composition structure of the lignite, the supercritical methanol was applied to extract the Inner Mongolia Shengli lignite and the temperature affected to the yields of the extract was investigated.The Gas Chromatography a nd Mass Spectrometry combined (GC/MS) was applied to analyze the chemical compositions of the extracts.The results showed the yield of the supercritical methanol e xtraction would be increased with the temperature increased.The products measured by the GC/MS were mainly the oxygenated compounds (mainly the ester, phenol a nd ketone compounds) , the aliphatic hydrocarbon compounds (mainly the n-alkane and aromatic compounds, mainly including 1-6 rings polycyclic aromatic hydrocarbo ns and alkyI substitution derivatives)，the aromatic compounds and the heteroatomic compounds (mainly the nitrogen compounds and sulfur compounds) .