Abstract: The types and distribution characteristics of submarine bedforms in the Liaodong Bay of Bohai Sea are described in this paper based on historical data, results of previous studies and the data obtained in the bathymetric, side san sonar,single-channel seismic and subbottom profile surveys carried out during the marine fundamental geological survey programs in China. There are various submarine bedforms,such as the tidal ridge,the tidal sand sheet,the tidal scour trough,the buried river vallies and the buried lakes.The factors that influence and control the seafloor bedforms development in the Liaodong Bay are discussed from the aspects of geological structure, sea-level and environment change, and river and tidal hydrodynamics.