In view of the automatic optical inspection (AOI) platform positioning precision control problem in the process of operation,putting forward a compound control algorithm based on the velocity and acceleration feedforward control algorithm and the PID feedback control algorithm. For improving the positioning precision of AOI platform,the compound algorithm eliminates the steady-state error of the system by tracking compensation control to the input. The AOI platform was designed based on the open CNC system. In the Matlab / Simulink environment,the position precision control simulation model was built based on the compound control algorithm,and the results verified the effectiveness of the compound control algorithm. Then applying this compound control algorithm to the ACR9000 controller,and conducting the experiment of the AOI platform based on the controller. The printed circuit board (PCB) test experiment was carried out based on the AOI platform,the results showed that the precision of AOI platform positioning was improved by the compound control algorithm and it met the detection requirements of printed circuit board,so the AOI platform can be used to detect the print circuit board.