Disclosed is a 3-dimension(3D) scanning system for a computer-aided tooth modeling capable of extracting a configuration of a tooth into a 3D configuration data in a short time. The 3D scanning system includes an image detecting part for extracting an image data of a tooth plaster model, a moving part for changing a location and a position of the tooth plaster model measured by the image detecting part, and a control part for changing and controlling the location and the position of the tooth plaster model by controlling the moving part to measure the tooth plaster model using the image detecting part.