Based on the DMC5480 motion control card, the RS232 serial communication is achieved by using the visual processing system, and a precise positioning system that can identify the robot arm is designed. The control system hardware is studied in detail and its control strategy is planned followed by preparing the PC operating software. Finally, an arm of a chess robot with visual recognition is designed. Experimental results show that the robot arm can replace the manual function along an arbitrary trajectory in the work area.