Abstract:Accompanying with the development of sounding technology, GNSS technology and high precision sensor integration, unmanned ship survey system provides new ideas for underwater topographic survey. Combining with Wangwu reservoir in Gaomi city in Shandong province, unmanned ship underwater topographic survey process has been studied. Through comparison and analysis, selecting the optimal survey line spacing to obtain data, evaluate the accuracy through difference analysis, and display the results after data processing. It is showed that the application of the unmanned vessel survey system based on single beam bathymetry in mediumsized reservoirs is very ideal, the quality of bathymetric data is good. It can well reflect the underwater topography of the reservoir area. The unmanned vessel survey system plays an important role in underwater topographic survey.