The fulvic acid extracted from a weathered coal (Tulufan, Xinjian, China) was methylated, and then oxidatively degraded with sodium dichromate (Na2Cr2O7) in water at 210-degrees-C. The degradation products isolated from the aqueous solution were analyzed using capillary gas chromatography-mass spectroscopy (GC-MS) after esterification. Thirty seven compounds were structurally identified from the degradation products. They were: (1) benzenecarboxylic, phenolic and methylbenzenecarboxylic acids, (2) naphthalenecarboxylic acids, (3) pyridinecarboxylic acids, and (4) aliphatic acids. The pyridine structures have never been reported in the relevant literatures.