With the completion of the Beidou Navigation Satellite System（BDS）Augmentation system for the Yangtze River trunk line，the method and effect of its application in waterway surveys need to be studied and certified.An experiment is conducted on the application of a post processed kinematic（PPK）technology based on the Beidou continuously operating reference stations（CORS）system for the Yangtze River trunk line in waterway surveys，and the accuracy of the experimental results is counted.On this basis，the method of applying this technology to waterway surveys on the Yangtze River is discussed，and its measurement accuracy is analyzed.The results show that when base stations in the Yangtze River CORS system are used to solve PPK positioning data，the positioning plane accuracy can meet the requirements of relevant specifications，whereas the elevation accuracy is unstable.