As main tools in deep ore-prospecting, geophysical prospecting methods and technology are more and more applied in mineral prospecting industry. Among which, geophysical prospecting is quite helpful when it is used at the bottom or peripheral part of the drillhole based on existing drillhole or pitting engineering. In this paper, a number of subsurface geophysical exploration methods such as downhole magnetic measurement, downhole induced polarization method, downhole (pit) "mise-á-la-masse" method, pit (downhole) self-potential method and downhole electromagnetic method commonly used for metallic deposits; starting from solved examples, the author analyzed and summarized advantages for all these methods used in deep-prospecting, it′s suggested to put more emphasis on sub-surface geo-physical technology, as well as research and development of relevant technology, which could be very important information guide for mineral prospecting, development, mining and construction.