Abstract：Nanling region has favorable geological conditions for mineralization and hence serves as the main tin producing area in China. In recent years new breakthrough has been made in geological prospecting. Beginning with an analysis of ore-forming geological background and the classification of ore deposit types, the authors chose some study areas where ore-forming geological conditions are favorable, tin resource are abundant, ore deposit types are complex and working extent is relatively high. Adopting the “three step” resource estimation method in combination with other multi-source geological synthetic prediction means such as the Chinese geological analogy method and the integrative geological method, the authors utilized the resources extent evaluation system to predict the tin resource potential.