HUANG Dong-zhao is a doctoral candidate in the School of Mechanical Science & Engineering, Huazhong University of Science and Technology. His research areas are in geometric modeling, and NC machining. ZHU Zhi-hong is a professor in the School of Mechanical Science & Engineering, Huazhong University of Science and Technology. His research area is in NC technology. ZHOU Hui-cheng is an associate professor in the School of Mechanical Science & Engineering, Huazhong University of Science and Technology. His research areas are in NC technology, laser measurement, and reverse engineering. SHI Han-min is a professor in the School of Mechanical Science & Engineering, Huazhong University of Science and Technology. His research areas are in NC and laser machining, rapid prototype technology, metal cutting and tool, and vibration and noise control.