Xixiayuan and Huang Grand Bridge is a grand bridge that crosses the Yellow River on the expressway from Luoyang to Jili District. The control survey mainly completes the second-class leveling survey and the second-class ranging trigonometric leveling. The company invested in a high-precision total station (Leica TM50) to implement triangular elevation measurement, which provided accurate technical data for the construction of the bridge and ensured the high-quality and efficient implementation of the bridge.