The development of low permeability reservoirs has become an important field of oil and gas development in China. CO₂ flooding in such reservoirs can achieve the dual purposes of enhanced oil recovery and CO₂ geological storage，but the adaptability varies with injection methods. On the basis of typical physical properties and fluid parameters of a low permeability reservoir，the numerical simulation is conducted for the adaptability of continuous gas injection（CGI），constant water alternating gas（CWAG），and tapered water alternating gas（TWAG）for enhanced oil recovery and geological storage.The results show that three injection methods can obtain the highest cumulative oil production and CO₂ storage capacity for the reservoir with the permeability of 1 mD. The working system constrained by the production gas-oil ratio（GOR）is more conducive to enhanced oil recovery or geological storage by CO₂ flooding. CGI is more suitable for CO₂ storage projects under 0.4 times the maximum GOR. CWAG is of more advantage in the project combining CO₂ enhanced oil recovery with geological storage under 0.2 times the maximum GOR. TWAG is more suitable for CO₂ enhanced oil recovery under 0.6 times the maximum GOR.