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. This paper presents principles of geological storage site selection in deep saline aquifers, and reasonably divides the stages of site selection. 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 guidance for CO2 geological storage project site selection in deep saline aquifers of China.