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Based on relocating the Jiujiang-Ruichang earthquake sequence which occurred on November 26, 2005 in Jiangxi Province with the double-difference (DD) algorithm and master event technique, the paper discusses the focal mechanism of the main shock (Ms5.7) and the probable seismo-tectonics. The precise relocation results indicate that the average horizontal error is 0.31 km in a EW direction and 0.40km in a NS direction, and the average depth error is 0.48km. The focal depths vary from 8kin to 14km, with the predominant distribution at 10km～ 12km. The epicenter of the main shock is relocated to be 29.69° N, 115.74°E and the focal depth is about 10.Skm. Combining the predominant distribution of the earthquake sequence, the focal mechanism of the main shock and the tectonic conditions of NE- and NWstrike faults growth in the seismic region, we infer that the main shock of the earthquake sequence was caused by a NW striking buried fault in the Rnichang basin. The nature of seismic faults needs to be further explored.