Abstract: With the continuous development of rail transit construction,the three-dimensional geographic information system is gradually applied in subway-related completion measurement, section measurement and deformation monitoring, which is increasingly favored by urban construction and metro management departments.Due to the complexity of subway management,it takes a lot of time and people to conduct operational monitoring using traditional methods.In order to meet the urgent requirements of the urban planning department and the metro management department for information and 3D visualization of Subway engineering,this paper proposes a mobile three-dimensional laser measurement system integrating multiple sensors.The system integrates sensors such as high-precision 3D scanners and encoders.which can get the profile size of the tunnel quickly and precisely. And can analyse limits, section profiles and tunnel deformations efficiently through complementary software processing.Through the actual project test,the results show that this method can effectively solve the practical problems in subway tunnel disease monitoring, and can be used as a reference for similar subway projects.

Key words: subway tunnel, deformation detection, mobile 3D laser measurement system, disease monitoring, all standing