A research area in Nzega region of Tanzania is covering so severe by fourth system that conventional geological prospecting methods are not available. In order to understand the stratigraphic or lithological boundary of the study area and to construct the production environment, it provides guidance function and effective prospecting information for the selected target area, carries out 1:10 000 the ground high-precision magnetic survey, delineate multiple linear magnetic anomaly zone of beaded displays for NW-SE and NE-SW. Based on the magnetic characteristics of gabbro, It is speculated that the magnetic anomaly belt is caused by intrusive gabbro dyke, thus clarifying the distribution characteristics of the linear structure in the study area. Combination of regional structure and distribution of gold deposits (points), that research the shear zone for NW-SE is the most close structure with gold mineralization relationship, to look for tectonic altered rock type and shear zone type gold deposit;After the surface engineering of the shear tectonic belt (SZ6) for NW-SE was revealed, gold mineralized alteration zone was discovered.