Xilinhaote lignite (XL) was depolymerized in supercritical methanol at 310 degrees C with or without air. According to gas chromatography/mass spectrometric analysis, the resulting soluble species (SSs) can be classified into alkanes, alkenes, arenes, alkanols, hydroxybenzenes, methoxybenzenes, ketones, esters, nitrogen-containing organic compounds, sulfur-containing organic compounds, and other compounds. The p-value of nonparametric statistics demonstrates that the group components and molecular mass distribution of the SSs from supercritical methanolysis of XL without and with air are not significantly different.