The relative permeability curve of oil and water has a very important role in the development of oil and gas fields. It can be used to analyze the law of oil production, calculate the oil production and flow ratio, and determine the saturation distribution of oil and water in reservoir and the location of oil and water contact surface. Based on the samples of 19-1 and 8-3 blocks in Wenchang Oilfield, the seepage curves of oil - water two - phase were calculated and the characteristics of the seepage curves under different flow rates were obtained.