Displacement measurement based on laser speckle is an important method widely used in practice, which is commonly realized by digital image correlation (DIC). However, the traditional method in pixel search algorithm is not very efficient for its correlation calculation. A new method of multi-characteristic windows is presented. Three distinct speckle sub windows with different sizes and different areas are selected as the calculation windows, which can not only guarantee the computational veracity properly, but also reduce the computation effectly. Experiments show that it is feasible and efficient, for it satisfies the computational veracity and improves the computational speed.