CO2 as the main cause of global warming is threatening the circumstance of human being living. So the geological storage of CO2 becomes one of the hot topics. By physics simulation experiments, the feasibility study of enhance oil recovery (EOR) using CO2 is studied. The results show that CO2 can not only enhance the recovery percent, but also can be stored in reservoir effectively. CO2 can greatly increase oil recovery percent compared with water flooding. Water alternating CO2 should given priority by using CO2. In case of water alternating CO2, the optimum gas water ratio is 1 1 and the optimum plug volume is 0.1 times of pore volume (PV), earlier water alternating CO2 will makes better development effect.