Abstract: Aiming at the problem that it is difficult to accurately restore the surface model of ore body due to the small amount of data in three-dimensional modeling of metal mines, a three-dimensional surface modeling method constrained by transverse drift data is proposed.Based on the analysis of data characteristics of missing orebodies from borehole data, the transverse drift map and orebody contour map in mine engineering drawings are taken as source data, and the transverse drift data are used to constrain the orebody contour line.On the basis of discussing the matching problem between transverse drift data and orebody contour line, the method of connecting the transverse drift point with the contour line and the constraint algorithm of the transverse drift data to constrain the orebody surface modeling are.Taking Inner Mongolia Youlougou mining area as the research object, the model is built.The results show that the three-dimensional modeling of orebody constrained by transverse drift data can better simulate the orebody surface morphology and improve the modeling accuracy, and the estimated reserves reach 2 384.39 kg.The reserves estimated by production detailed survey report are not different from those calculated by the interpolation of orebody modeling, and the results are more accurate.Therefore, this modeling method is conducive to further accurate estimation of orebody reserves.