Based on observations of spontaneous potential in workings and drill holes and on model tests, this paper holds that the spatial distribution of spontaneous potential in the metallic orebody has characteristic of dipole field with centre of positive anomaly and that of negative anomaly. The spontaneous electric field is largely affected by half space. Orebodies occurring at greater depth form"8"-shaped potential distribution, while those present at smaller depth give rise to a potential distribution like biparted hyperbola.A study on spatial distribution of spontaneous potential suggests that observation of spontaneous potential in workings and drill holes of metallic deposits might reveal the buried depth and occurrence mode of orebodies, and help to detect blind orebodies adjacent to drill holes and wall of workings as well.