In order to further improve the recovery of reservoir after polymer flooding, the concentrations of pre?crosslinked gel particles (PPG) and three component composite systems were optimized in the adaptive system after polymer flooding through the laboratory investigation. The experimental results show that, when PPG concentration and polymer concentration are 400 and 1 200 mg/L, and injection volume is 0.5 PV in the adaptive system, the self?adaptive flooding system after polymer flooding further enhanced the oil recovery by 18.25%, and the total oil recovery reached the best of 71.2%. Compared with polymer flooding stage, the cumulative imbibition ratio of high permeability layer decreased by 15.00%, the cumulative imbibition ratio of medium and low permeability layers increased by 6.50% and 8.97%, respectively. The recovery of medium and low permeability layers increased by 5.07% and 9.49% respectively, the recovery rate of high permeability layer only increases by 3.63%. It can be seen that the optimized system can play a better role in profile control.