Abstract: In view of the complex hyperboloid structure of the track, there is no BIM model for reference and the accuracy of surface detection is high, this paper takes snowmobile and sled track of Beijing Winter Olympic Games as an example, proposes to use 3D laser scanner to scan the finished surface of the track, combined with the architectural design coordinates to complete the feature point detection. And the design 3D coordinates are modeled, the model is compared with the scanning point cloud data. The deviation value of any point can be grasped by generating 3D chromatogram. The results show that this method can not only solve the detection of key feature points, but also fully grasp the deviation of the whole complex surface, and meet the requirements of high-precision measurement, which provides ideas and technical reference for such complex surface detection engineering in the future.

Key words: multistation scanner, complex surface, 3D laser scanning, curved surface measurement, Beijing Winter Olympic Games