Abstract: In order to solve the technical problem of rationality analysis of phase permeability curve, based on a large amount of basic data of phase permeability curve in Bohai oilfield, the curve form of phase permeability curve was analyzed, the distribution range of oil-phase index and water-phase index was calculated, and the change regularity of end-point value of phase permeability curve and air permeability was studied. A set of comprehensive analytical techniques for phase permeability curve rationality of medium and high permeability sandstone reservoirs in offshore oilfields were established, which consisted of "curve morphology analysis method", "oil-phase index and water-phase index analysis method" and "endpoint value analysis method".The application results show that these techniques can provide guidance for technicians to analyze the rationality of the phase permeability curve, to ensure the reliability of reservoir research results and has good application value.