This paper describes a new method for the visualization of 3D image data reconstruction, and its core theme is that decompose 3D model into a group of orthogonal basis extended coefficient of spherical harmonic function. The paper using least squares method for transforming the original coordinate into orthogonal basis extended coefficient of spherical harmonic function. These coefficients can reconstruct image 3D model through personal computer (PC). The theory and test shows that the modeling speed of method is much higher than some traditional method of modeling. It may provide a new way for solving the problems in the field of 3D models reconstruction for large visualization data and slow modeling speed.