Abstract: Through process and interpretation of the measured data of 1:50 000 Jialu Sheet gravity survey in northeastern Jiangxi Province, this study infer and reconstructs the structure system of the Jialu Sheet, and explains the morphology, extension and nature of the main faults. Combined with the concealed intrusions in the study area, which were outlined by magnetic anomalies, their external contact surface morphology and depth were determined using the 2.5D interpretation. Based on geologic and geochemical anomalies of typical ore deposits in the region, the metallogenic prospect areas were delineated and predicted. Study of relationship between tectonics, intrusions and metallogenesis suggests that the faults controlled the migration of the magma and hydrothermal fluids, and then controlled development and spatial distributions of concealed intrusions and endogenous metal deposits. Compared with other geophysical survey methods, gravity survey has its own advantages in explaining fault framework, and should be one of the best geophysical methods to identify regional structures, hidden intrusions and concealed deposits in mineral geological survey.