Abstract: We relocated 545 earthquakes that occurred in northern Jiangxi Province, from January 2008 to July 2019, using the double-difference location algorithm to improve relative location accuracy. Compared with the initial locations, the results of precise relocation in Jiujiang, Yichun and Xinyu areas are more concentrated. According to the precise relocation results, composite fault plane solution was calculated with the grid point test method. The result shows that the direction of maximum principal stress of Jiujiang and adjacent areas is nearly EW and that of the minimum principal stress is nearly NS, which is basically consistent with the previous research results. It is considered that the more research is needed to further refine and analyze characteristics of tectonic stress field in Jiujiang area. In Yichun and adjacent areas, the direction of maximum principal stress is nearly EW and that of the minimum principal stress is NNE and the area is in a thrust stress regime.