Optical Flow is useful to calculate object movement in computer vision field. It is difficult to realize the optical flow system because of huge data needed to be processed for dynamic images. DSP and FPGA chips are used to solve this problem. The hardware of system is designed by using DSP TMS320C6713 and FPGA XC3S400AN. The L-K algorithm is realized in the system. The experimental result shows that system can work with high accuracy and anti-jamming ability. Therefore it is useful to improve the performance of computer vision computing.