The grade distribution of tin and zinc samples and the variograms of tin and zinc elements for Manjiazhai mineralization segment of Dulong tin deposit in Yunnan province were studied by using the principle of geological statistics and 3D mining software SURPAC. The grade models of both tin and zinc elements for the mineralization segment were established by Kriging method. The comparison of the modeled reserve results with that of traditional reserves calculation showed proved the veracity of this modeling method.