Abstract: This paper introduces the research and application of mechanical subdivision water plugging technologies at high water cut stage in Daqing Oilfield, especially the principles of technologies developed since 1990:sliding sleeve measuring-plugging technology, suspenslon mechanical subdivision water plugging technology, hydraulic multi-layer water plugging technology and hydraulic slide rail three-layer water plugging technology. This paper also makes a preliminary discussion to the developing prospect and direction of mechanical water plugging technologies.