Abstract:TO speed as the goal of particle image,using the optical flow field to model the optical flow for a digital image, it is feasible to calculate the velocity field for each pixel in PIV.Comparing the different particles under the condition of the velocity field so as to achieve paticle image according with optical flow test method. In this paper the Lucsa-kanade algorithm is implemented and performance evaluation is conducted. Optical flow plays important roles in PIV, which can find out the velocity field and helps to correct misleading results obtained by traditional PIV methods.