This Training System is designed to aid the students in understanding the concepts and principles of Dental Chair. Dental chair adopts low-pressure mute DC motor driving and full-computerized control with two control points at main switch and foot switch. The design of the control switches is lines up with the human mind and behavior habits, which greatly increases the instrument’s safety index, facilitate the dentist to work accurately and quickly. Its cushion adopts the integrated seamless foaming technology. The trainer is designed to demonstrate the operation, theory, repair and servicing of Dental Chair equipment that used at clinics & hospitals. The unit given the fault diagnosis so as to facilitate the teaching of trouble shooting techniques. A fault simulator is provided with circuit block diagram of the device for the students to study theoretically and experimentally in order to understand the operation of the device.