Abstract: Taking NLSD-1 borehole (100~1 000 m) of Nanling Scientific Drilling as the object，magnetization characteristics of different lithologies are researched by utilizing magnetic susceptibility of well logging，borehole magnetic tri-component data and record data of lithology.Meantime，anomalies of borehole magnetic tri-component are analyzed and interpreted.Magnetic susceptibilities of different lithologies diversified from high to low are: metamorphic fine-cutting sedimentary tuff，metamorphic dusty-cutting sedimentary tuff，multi-mineralized metamorphic fine-cutting sedimentary tuff，silicified metamorphic fine-cutting sedimentary tuff，silicified metamorphic dusty-cutting sedimentary tuff，multi-mineralized metamorphic dusty-cutting sedimentary tuff，tuffaceous slate and multi-mineralized tuffaceous slate; Anomalies of borehole magnetic tri-component are principally caused by magnetic body beside borehole and metamorphic sedimentary tuff.

Key words: Nanling scientific drilling, Multi-metallic deposit, Magnetic Susceptibility, Borehole tri-component magnetic survey