Abstract:Based on the construction of the cable-stayed bridge of Guangxin Bridge in Huaiyang Expressway, the monitoring and measuring technologies of long-span cable-stayed bridge are mainly expounded. The main contents include the establishment of plane and elevation datum, the displacement measurement of main pylon, the observation of main beam alignment, the selection of the relationship curve between the temperature and time and the elevation of main beam, and the selection of observation period, etc.