It is an economic practical equipment, designed in 2003. Driven by whist low-voltage DC motor with air spring auxiliary balance; integral ceramic spittoon; application of engineering plastics single forming seamless leather cushion; anti-return design for cooling water of bur prevents cross infection between patients; interlock design between equipment and chair ensures safer operation; constant-temperature and quantitative (computerized) water cupply system, spittoon rinsing time selection. Improving from the basic design: adding cotton tin setting; super-low seat (41 cm) position design; size increase of cushion and backrest to provide a more comfortable seating; speedup the movement of backrest one time more to increase the work efficiency, Non-slip holder design, avoid handpiece dropping; combined foot control contains function of chair movement, flushing, gargling and handpiece operating operation light with 3 intensity and automatic off function, reduce the movement and hand work of dentist during the operation, more efficiency