Abstract: Cobalt-rich crustation deposit is a stratiform one growing on the surface of seamount.It differs from the polymetallic nodules distributed in two-dimensional space in that its distribution is largely dependent on the morphology and micro-geomorphology of the edge and slope of seamount platform, so it can be regarded as a special three-dimensional surface deposit.The traditional two dimensional estimation modeling cannot truly and intuitively reflect the spatial distribution characteristics of seamount crustation deposit.However, the mature database technology of Micromine, 3D modeling technology of deposit and GIS spatial analysis method can be used to comprehensively display its three-dimensional morphology and spatial distribution, and the inverse distance weighting method and closed polyhedron method can be used to verify its resource quantity.The application of the 3D evaluation modeling of crustation deposits conforms to the current development trend of metallogenic prediction and reserve evaluation of 3D digital deposits, and also provides technical support for the exploration and regional target optimization of cobalt-rich crustation resources in China.