Abstract: Aiming at the higher polishing requirements of the laser crystal, a scheme of the control system for the ultra-precision continuous polisher is adopted based on the hardware structure of the industrial control computer, the motion control card, the driver and the motor. Combined with the software structure of LabVIEW environment and Advantech application programming interface (API), the control system is designed and developed. After debugging and application, the velocity fluctuation of the polishing disc is less than 1%, while that of the unit of the workpiece is less than 5%. The whole system starts smoothly and has no overshoot, which should satisfy the polishing requirements of the laser crystal.