This paper analyzes and compares spatial data interpolation algorithms, and used the geological spatial data measured from Chengchao Iron Mine in China to verify the distance power inverse ratio interpolation method, then adopts the three-dimensional geology and mining engineering simulation system developed by the authors to visualize the interpolated data, from which a true 3D images of ore body revealing the spatial distribution and change trend of ore grades with various colors are obtained, thus, prove that the interpolation algorithm is effective and the interpolated result is rational.