The storage of saline aquifers has the greatest potential in the CO₂ geological storage. At present，the successful demonstration projects of typical CO₂ geological storage in the saline aquifer in the world include Sleipner and Sn?hvit in Norway，In Salah in Algeria，and Shenhua in Ordos Basin，China. These projects provide long-term Carbon Capture and Storage（CCS）experience and are of reference significance for the implementation of future CO₂ geological storage projects.Given the geological characteristics of the structure，reservoir，and caprock，this paper analyzed each case in combination with the injection and monitoring plans of each demonstration project and extracted geological and engineering parameters.Then，the influence of geological characteristics on CO₂ geological storage was analyzed to clarify the feasibility of CO₂ geological storage with structural features such as anticlines，fault blocks，and fractures. The injection and monitoring plans for CO₂ geological storage in the saline aquifers were also compared. The following conclusions are drawn：①The success of the Sleipner CO₂ geological storage project is attributed to the simple structure，large area，good physical properties of the reservoir as well as the large and stable caprock thickness. The faults developed in Sn?hvit and fractures in In Salah also verify the possibility of CO₂ geological storage with different structural characteristics，and the distribution of CO₂ plume is controlled by geological characteristics. ②There are relatively few injection wells for CO₂ geological storage in saline aquifers，but the injection volume is relatively large，and horizontal wells dominate. ③High-quality monitoring data can effectively reduce potential leakage risk，and a variety of monitoring combinations can contribute to the long-term safe CO₂ geological storage.