Image stitching is normally used to make up a seamless and high resolution with a set of the overlap parts of images and videos.It is one of important technologies for image processing.Presented the main step of the image mosaics,basic principle and advantages and disadvantages of the ration matching algorithm,based on the ratio matching algorithm,an improved algorithm of image stitching is presented in order to resolve the pseudo matching.Using the theory of geometric proportion,comparing with traditional methods,the algorithm can find the optimal position more quickly and more exactly.The experiments show that this method can eliminate false matches validly.