With the rapid development of satellite navigation and positioning, GNSS technology has gradually been deeply applied in road engineering and rail transit construction. It has broad application prospects in railway surveying, construction, and later maintenance and management, and has brought considerable economic benefits to the development of the national economy . The rapid development of high-speed railways places higher requirements on survey technology. Due to the long lines and few known GNSS control points, conventional measurement methods are not only difficult to lay out the network, but also difficult to meet the requirements of high accuracy. GeoRTK uses GNSS measurement technology that can overcome the shortcomings listed above, improve the efficiency of operations, reduce labor intensity, and ensure the quality of railway survey and design.With the rapid development of satellite navigation and positioning, GNSS technology has gradually been deeply applied in road engineering and rail transit construction. It has broad application prospects in railway surveying, construction, and later maintenance and management, and has brought considerable economic benefits to the development of the national economy . The rapid development of high-speed railways places higher requirements on survey technology. Due to the long lines and few known GNSS control points, conventional measurement methods are not only difficult to lay out the network, but also difficult to meet the requirements of high accuracy. GeoRTK uses GNSS measurement technology that can overcome the shortcomings listed above, improve the efficiency of operations, reduce labor intensity, and ensure the quality of railway survey and design.