How to reduce the CO₂ emission is the focus of world attention. The question about global warming caused by greenhouse gases is more and more serious. Therefore we have to take active measures to deal with it. Applying CO₂ EOR is an important way to bury CO₂. CO₂ EOR includes miscible displacement and immiscible displacement. The amount of CO₂ storage underground depends on the reservoir properties and EOR values. Research on computational method about CO₂ storage is an effective way to increase the petroleum production and improve the development effects, which will offer theoretical and practical foundation to the global ecological protection, the production of the petroleum resources with the high standard and the great benefit ,and the sustainable development.