Abstract: Aiming at the synchronous motion control of the dental arch generator with multi-motor drive,this paper analyzes the kinematics of the dental arch generator,and presents a hardware control scheme based on industrial personal computer and control card PC6401.Real-time closed loop synchronous control is realized for the dental arch generator based on multithreading technology and VC++6.0,and experiments on control and tooth-arrangement are performed with a multi-manipulator tooth-arrangement robot prototype.The experiment indicates that the application of multithreading technology to the control program prevents the main thread block in real-time control,and realizes parallel coordinated control for the dental arch generator.Error analysis and tooth-arrangement experimentation are made,and the results indicate that the control strategy and technical route can fulfill the requirements for motion speed and location precision.