Carbon dioxide（CO₂）geological storage technology had become a research hotspot with the concern of greenhouse gases emission. CO₂ storage in oil and gas fields could help reducing greenhouse gases emission and enhancing oil recovery（EOR） .Therefore，it became one of the most important technologies to reduce large-scale CO₂ or other greenhouse gases emission and enhance oil recovery. The solubility and diffusion coefficient of CO₂during CO₂ injection in oil reservoir，the density and volume change of system caused by CO₂ dissolution were key theoretical basis for CO₂ geological storage technology. In this paper，the research progress on those parameters were reviewed，and the technology of CO₂ for EOR was introduced. In addition，the shortcomings in the current research and the development direction were presented.