Abstract: As the traditional method of image matching algorithm involves a large amount of calculation,a modified correlation matching algorithm is proposed.The correlation coefficient is simplified,using iterative calculation and reduced duplication in operation.By setting the correlation coefficient threshold,only the point is calculated where the difference of variance between the correlation coefficient point is small,thus the speed is increased.Computing time can be reduced to only 14% of the original or less.In the folder of image search are realized fast matching of images.