Abstract: Aiming at the problems occurred in liquid enhanced wells, based on EOR mechanism of liquid extraction, by using numerical simulation technology, the influence factors research of liquid extraction effects under different geological conditions and development conditions has been carried out and then the policy limitation of liquid extraction has been determined. The simulation results show in positive rhythm model, with the increase of permeability ratio, the EOR amplitude first increases and then decreases. While in reverse rhythm model, with the increase of permeability ratio, the EOR amplitude decreases all the time. When the liquid extraction is about 140%, the EOR amplitude is the biggest. The earlier the liquid extraction moment, the higher EOR amplitude. Among the liquid extraction manners, when the permeability ratio is 0.6, the effect is the best.