Due to the shortage of bacteria resources for bioremediation of TNT red water polluted soil, a 2,4-dinitrotoluene sulfonates degrading strain X2 was isolated from a commercial microbial consortium. Based on the 16S rDNA sequence analysis and the physicbiochemical characteristics, strain X2 was identified as Sphingobium sp.. The growth experiments were carried out to optimize the growth condition of X2. The biodegradation mechanisms of 2,4-DNT-3-SO₃^- and 2,4-DNT-5-SO₃^- by X2 and its biodegradation ability towards other niro-aromatic explosives were investigated. The results showed that the optimum growing conditions for X2 were 30^oC, pH=7 and 1% salinity. The removal efficiencies of 2,4-DNT-3-SO₃^- and 2,4-DNT-5-SO₃^- reached 100% after 12 and 3 days, respectively. Liquid chromatography-mass spectrometry analysis showed that the nitro groups in dinitrotoluene sulfonates were transformed to amino groups. Sphingobium sp. X2 has broad-spectrum degradation characteristics. It can degrade not only dinitrotoluene sulfonates, but also other nitroaromatic pollutants like 2,4,6-trinitrotoluene, dinitrotoluene and mononitrotoluene, providing possibilities for TNT red water bioremediation.