16-bit microcontroller is used to control system as the core controller. Moving parts are driven by position-servo-system. Buttons switch, adjustable stroboscopic light source and fiber optic sensors are isolated by high-speed opto-couple TLP521-4. Optical fiber sensors and servo encoder feedback signals, complementing each other, were combined in the controller design. Through the analysis and design of the control system, the analysis of the relationship between the exposure time and light frequency and the analysis of relationship between the CCD image acquisition frequency, in-depth research and demonstration are done. The control system has been successfully applied to the appearance of PCB optical inspection machine. Experiments show that the system has many significant properties, such as high precision, small error，high stability and flexibility of parameter changing.