Abstract: Based on the theory of Type-A waterflooding characteristic curves, because the percolations of CO2 and oil during CO2 flooding in low permeability reservoirs are in accordance with the power exponent law, the paper derives the CO2 flooding characteristic curves for low permeability reservoirs, establishes a relationship between quasi-content of CO2 and recovery percent of reserves and obtains a series of methods to predict recoverable reserves and recovery factor of CO2 flooding in low permeability reservoirs. The characteristic curves of CO2 flooding in low permeability reservoirs show that the modified relationship between cumulative CO2 production and cumulative oil production is semi-logarithmic. The field application indicates that the dynamic indices such as recoverable reserves and recovery factor by CO2 flooding in low permeability reservoirs can be better predicted with the characteristic curves, which is helpful for block development evaluation