Abstract: Abstract：According to the potential evaluation result of CO2 geological storage in China’s sedimentary basins, the authors consider that the deep saline aquifer is the main body for realizing CO2 geological storage. The properties of the appropriate CO2 geological storage in deep saline aquifers are defined and analyzed. This paper presents principles of geological storage site selection in deep saline aquifers, and reasonably divide the stages of site selection. The evaluation index system can be established on the basis of four indicator layers and more than 60 special indicators from the conditions of location technology, security, economic suitability and land geology-social environment. Ranking multi-factor index method on the basis of AHP could be used for CO2 geological storage project site selection. The result of this study will provide a guidance for CO2 geological storage project site selection in deep saline aquifers of China .