Abstract: Objective In order to applied the three-dimensional laser scanning technology to tunnel deformationfield,this paper proposed the overall tunnel deformation monitoring methods to replace the traditionalsingle-point monitoring with engineering experimental research tools.Described the operation proces-ses and pointed out what should pay attention to,discussed the point cloud registration and coordi-nates conversion problems.The study showed that the scanning stations distance can not exceed thediameter of the tunnel if ICP registration is taken,and set the reasonable scanning resolution to highresolution grade is appropriate.In order to avoid obstacles impact it is needed to scan on both sides ofthe tunnel centerline as scanning shielding rate is too large.The new method gives a fast,full accessto get the complete deformation data of the tunnel surface and overcomes the shortcomings of the tra-ditional methods.