Limited by the project cost，working environment，working time and social resource allocation，inland river surveying and mapping is mostly conducted by traditional surveying and mapping methods.For long surveying line，complex and comprehensive control surveying technology，large water level ratio，scattered operating points，etc.，the methods research of overlong inland river control survey and depth survey is necessary.The network CORS is used for the control survey，which can get accurate coordinates and be used directly for the base station to launch.The RTK three-dimensional water depth measurement can effectively eliminate the influence of moving draught and wave and avoid water level correction error caused by tidal level observation.After comparing with the traditional surveying method，the accuracy meets the standard requirement and the method is proved accurate and reliable.The research can improve efficiency and save cost，and provide reference for the smooth implementation of similar river channel measurement.