Abstract: Deepwater seismic survey is influenced by water depth, sea conditions, topography, geological conditions, acquisition method and other factors. As known, the velocity analysis is interfered by such features as anisotropy, sensitive speed changes, serious noise interference and uneven distribution of lighting. Conventional method of velocity analysis is not sufficient to meet the requirement of deepwater seismic data velocity analysis. To solve these problems, the authors adopted the method of high-density anisotropic bispectrum velocity analysis to pick up the high-density speed and the anisotropic parameters. This method has been applied to the South China Sea for deepwater seismic data velocity analysis, and proven to be effective.