Abstract: The Baiyinnuo'er lead-zinc deposit is the largest lead-zinc deposit in the north part of the Changjiang river in China. Ore bodies are obviously controlled by strata lithology and fold structure deformation in this deposit. Generally, the fold axis bends down to SW direction, with an angle about 25°, and its trend is along NE direction, but the fold shape in the south ore belt is slightly different to that in the north ore belt. Based on characteristics of tectonic-controlling mineralization, the 2nd ore body's extend was pursued to depth situation at the high coverage fraction area in the south part of 29 line with an EH4 conductivity image system. The result shows that the studied area is a new mineralization belt. The electricity nature difference of the geologic body underground based on EH4 anomaly can be exactly explained according to the known characteristics of tectonic-controlling mineralization. Therefore, the 2nd ore body still extends to depth in the south part of 29 line.