Abstract: During the service of the tank, it will be deformed or tilted due to the settlement of the foundation, improper process operation, and changes in external loads. The detection accuracy of conventional detection methods (lead hammer detection, whole station scanning, level measurement, etc.) is easily limited by the on-site environment and personnel level, and the later data processing workload is large. In order to solve the above problems, a three-dimensional laser scanner is used to scan the spatial data of the tank in whole or in part, and the point cloud data is obtained. Through splicing, noise reduction, filtering and grid processing, the digital model of the tank can be obtained, which can realize the analysis and evaluation of tank deformation, roundness, verticality and settlement. Compared with conventional means, high efficiency, wide detection range, the present one is shown to be of high measurement accuracy, and more convenient data storage and processing.