Due to the fact that the method of black oil model equivalent treatment fracture is unable to reflect the property of crack in the reservoir quite well, based on the theory of fracture-matrix coupling seepage, a 3D numerical model for oil-water two-phase fractured reservoir is established. By using the numerical model, the effect of different reservoir geology and development conditions on the weak gel modulation drive is researched, and the distinctiveness evaluation for the main influential factors is conducted, and the reservoir conditions for fractured reservoir appropriate flooding are put forward. By taking Jiangsu Oilfield as an example, the orthogonal analysis method is used to process the optimization design for real reservoir displacement parameters, the study results involving the utilization of weak gel modulation for fractured reservoir are able to improve recovery efficiency and have practical significance.