Abstract: The DPIV (Digital Particle Image Velocimetry) is a kind of method to obtain velocity fields quickly. But the accuracy of this method is not high. Although the improved methods improve the accuracy greatly, but they lost the advantage of fast processing of DPIV. In this paper, a new method is presented which has the both advantages of fast processing and high accuracy. This new method is based on the DPIV technique which was presented by Willert, and absorts the idea of iteration in Huang's improved method. So the method maintains the advantage of fast processing of DPIV and improves the accuracy to certain extent. It fits for measurements of velocities in constant and tidal flow.