Abstract: In this paper, the three-dimensional laser scanning monitoring technology is applied to the deformation monitoring of subway tunnel structures, and good results have been achieved.The method first uses high-density point cloud information obtained by a three-dimensional laser scanner to extract tunnel structure information; and then realizes rapid processing of point cloud data through automated processing software, automatically extracts ring point cloud, and finally uses the extracted ring point cloud Analysis of structural deformation such as ring stagger and horizontal convergence.This article introduces the application case of 3D laser scanning in the construction of a subway project in Wuhan, and explains the great advantages of 3D laser scanning for tunnel structure monitoring.