With the development of CO2 capture technology，CO2 reinjection to the formation may improve oil recovery. Surfactants that could form stable foam with CO2 are selected，and static physical properties and plugging ability of the foam system are evaluated. The influence of various injection methods on the displacement efficiency is analyzed. Compound anionic-nonionic surfactant system（S6-1）is designed as foaming agent with foaming volume of 213 mL and half-life period of 1 112 s，which is better than other surfactants. The CO2 foam system has the characteristics of temperature resistance，salt resistance，low adsorption loss and excellent plugging performance. When the rational gas-liquid ratio is 1∶1 and mass fraction of the foaming agent is 0.5%，resistance factor of the CO2 foam system is stable. Enhanced oil recovery（EOR）is the highest when alternate injection of CO2 foam system and water，and the ultimate recovery reaches to 60%. The CO2 foam system shows good plugging performance and good residual resistance in subsequent water flooding.