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The paper has proposed an improved method of recording data in STL file format against disadvantages, such as high repetition of recording triangular meshes data and complex computation of vertex coordinate. Vertexes and normal vectors of triangular meshes are renumbered, and meshes data expressed by coordinate is changed into data stored by number. It facilitates the recording of triangular meshes data of depth images and provides a more simple way for establishing data storage model.

Apply the rapid prototyping in the 3D reconstruction of solid model of lumbar. By separating the original CT image data according to threshold value, filling and repairing the hole and generated the STL file of lumbar, using Geomagic and UG NX software to complete the model of intervertebral disc and assembly of lumbar. Finally, the model was manufactured through FDM Vantage i rapid prototyping machine.