The study of internal-wave and internal-tide deposits is a new research field on sedimentology during the last ten years.Deep-water traction currents induced by internal waves and internal tides are developed on the modern sea floor,which can form not only all kinds of small scale and dispersal deep- water traction currents deposits,but also large-scale sediment wave in km-size scale.In this paper, the concepts and features of internal waves and internal tides in oceanography are introduced,and the characteristics,sedimentary sequences,sedimentary microfacies and sedimentation models of internal- wave and internal-tide deposits found and the origin of large scale sediment waves in deep sea bottom are summarized.The relationship between internal-wave and internal-tide deposits and petroleum is discussed,and finally internal-wave and internal-tide deposits are shown to be a new potential field for petroleum exploration. The study of internal-wave and internal-tide deposits is a new research field on sedimentology during the last ten years. Deep-water traction currents induced by internal waves and internal tides are developed on the modern sea floor, which can form not only all kinds of small scale and dispersal deep-water traction currents deposits, but also large-scale sediment wave in km-size scale.In this paper, the concepts and features of internal waves and internal tides in oceanography are introduced, and the characteristics, sedimentary Sequences, sedimentary microfacies and sedimentation models of internal-wave and internal-tide deposits found and the origin of large scale sediment waves in deep sea bottom are summarized. The relationship between internal-wave and internal-tide deposits and petroleum is discussed, and finally internal-wave and internal-tide deposits are shown to be a new potential field for petroleum exploration.