In picture archiving & communication system (PACS) image processing, the conflict problem between resolution and field of vision is often met. The greater is the field of vision, the smaller is the resolution. The problem can be solved by image stitching technology effectively. Choosing a robust and rapid image registration method is the most important thing for achieving good effect of image stitching. The image stitching process is introduced at first. Then the advantages and disadvantages of the detection algorithm for different feature points based on feature image registration are analyzed and compared in detail. The detection algorithm for speeded up robust features (SURF) point is realized through C language finally. And the real PACS images are used to test the effectiveness of detection algorithm for feature points in PACS images.