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Modelling 3D stratum surface is difficult because the number of exploratory holes is usually too small. As an attempt to solve this problem, many interpolation methods were proposed to estimate the surface between the holes. In this paper, we propose an approach to interpolate 3D spatial points and model stratum surface. The curvature of the original surface mesh is embedded into kriging interpolation method and applied to determine interpolation density and generate self-adaptive mesh. In experiments, we offer the comparison between our method and other interpolation methods and give the analysis and efficiency of our method.