Abstract: Carbon Capture and Storage (CCS) technology is one of the effective ways to offset global warming and reduce CO₂ emissions, and its potential assessment is crucial. The CCS technology mainly includes three types: CO₂ Enhanced Oil/Gas Recovery (EOR/EGR), CO₂ Enhanced Coal Bed Methane (ECBM) and CO₂ storage in saline aquifer. The potential assessment methods are slightly different due to the different sequestration mechanisms of different sequestration technologies. The structural space storage, confined space storage, dissolution storage, and mineralization storage sealing mechanisms are mainly used in oil and gas reservoir storage and saltwater reservoir storage, while the adsorption sealing mechanism is mainly used in coal seam storage. The corresponding calculation methods for various storage technologies were put forward by researchers and institutions, and these methods can be classified into four categories according to their calculation principles, which are material balance method, effective volume method, dissolution method, and mixed mechanism method considering various capture mechanisms. In this paper, the authors have analyzed connotation principles and application scenarios of storage potential evaluation methods and put forward the practical problems of CO₂ geological storage potential evaluation, which could improve the quality of CCS potential assessment in our country.