Objective In order to reconstruct and measure anatomic structure of acetabulum, a lot of information in the CT image were required to detect the aetabulum contour coordinate. Methods The algorithm of histogram-threshold segmenting and Kirsh boundary detection were employed for making a binary contour image. The coordinate of contour were detected by "maze" boundary tracking algorithm . Results This approach could process the information of image contour in the manner of large scale, rapid process and less error.