AIS800S effectively combines the 3D laser scanning system and A-INS track measurement system for subway and high-speed rail tunnels to expand the measurement information in multiple dimensions. When the track measurement system completes accurate track measurement, coordinate information and attitude information can be provided to the 3D laser scanning system. All kinds of information about the tunnel measured by the 3D laser scanning system will have accurate coordinate information, which will provide more complete and accurate information for the subway tunnel and high-speed railway tunnel measurement and BIM management.