Aiming at the problem of tapping the remaining oil in E2d2 reservoir of Z11 block in Jiangsu Oilfield with high water cut, the distribution law of remaining oil was analyzed based on the classification of different reservoir types according to the results of reservoir numerical simulation. Further the evaluation method of residual oil distribution quality was established by using the two indicators of production difficulty index and residual reserve abundance. According to the classification limits of evaluation indicators calculated by iterative threshold method, the residual oil distribution quality was divided into four types and the corresponding potential tapping direction was determined. Finally, according to the evaluation results of remaining oil distribution quality of E2d2 reservoir in block Z11, the field application of tapping the potential of remaining oil was carried out, and a good adjustment effect was achieved.