Abstract:At present, injecting CO2 into the subsurface oil and gas reservoirs, deep saline aquifers, disused coalbeds and salt caverns, to store CO2 in subsurface is the most valid and economic choice in reducing the CO2 emission into the atmosphere. No matter what reservoirs will be chosen to the subsurface geological storage of CO2, we all wish the time scale of CO2 geologic storage will be longer and longer. However, due to some objective and subjective factors during the engineer operation, such as the abandoned wells without any confined treating, the faultfractured system and the hydrodynamic system and induced seismic, the leakage risks are inevitable. They might be harm to the human and local environment. Thus, it is necessary to the leakage risk assessment of CO2 geologic storage, which is the indispensable basis and guarantee to safely and effectively geological storage CO2 for a long term. This paper aims to establish a series of integrated leakage risk assessment system through deeply analyzing the possibilities of releasing risk and pathways during the geological storage of CO2, and provides some relevant remediation options according to different leakage risks and pathways, which will promote the global development of CO2 geological storage, especially in our country.