At present, the enhanced liquid has become an important measure for improving the development results and achieving stabilized or enhanced oil production. To find out the particularity of water flooding mechanism in high water cut stage for heterogeneous reservoir, the 74-81 unit of Es2 in the block No.2 of Shengtuo oilfield is taken as the experimental simulation unit, and the physical model experiments are used to study the influencing factors and functional mechanism of enhanced liquid result in ultra-high water cut stage, and results showed that the water cut is reduced and then increased in the initial stage of enhanced liquid for single layer, the upward trend is slowed and significantly enhancing the oil recovery, however, depending on increasing the water-flooding pressure to enhance the degree of reserve recovery is not feasible; For enhanced liquid in multi-layer and conventional water-flooding, the stronger inter-layer heterogeneity, the lower degree of reserve recovery of low-permeability layers for the higher permeability layers’intense interference, it is difficult to establish an effective drive differential pressure, on the contrary, the lower the permeability ratio, the higher its oil recovery. The enhanced liquid can significantly enhance oil recovery, and its effect is mainly affected by the reservoir heterogeneity degree, enhanced liquid amplitude and the injection volume; For the enhanced liquid, increasing water flooding differential pressure can enhance waterflooding sweeping efficiency in high permeability layers, and improving the oil producing degree in low permeability.Simultaneously, the balance of displacement velocity and denudation speed is also related to the effect of the enhanced liquid to improve oil recovery.