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3D medical model is widely used in modern surgery, and image processing is the main method for its reconstruction. Because the structure and shape of human organs are very complicate, triangular mesh is more appropriate than 4-sides path surface for medical model. To promote the application of 3D medical model based on digital triangular meshes, technologies of precise reconstruction via image processing, RE based editing and triangular mesh based forward design are integrated and used to create precise original model, cut model, repairing model and surgical aid tool. The applications illustrate, with proposed method, 3D medical model based on digital triangular mesh can be handled freely as wanted, and used successfully in clinic to improve the operation quality and precise degree.