Abstract: CO₂ geological storage in deep saline aquifers has been considered to be one of important technologies to mitigate global climate change, which is essentially equivalent to find some suitable reservoirs underground for CO₂ injection and storage for a very long time. Deep underground spaces are important natural resource for social development in the future. It is necessary to enact laws or regulations to manage the underground spaces development for CO₂ geological storage in deep saline aquifers. In this paper, we summarized the experience of management on CO₂ geological storage in some developed countries and areas. Based on the study of geological mechanism of CO₂ geological storage, we suggested approval and management process, and also five key technical parts which should be paid more attention by Ministry of Natural Resources, including confirmation of underground space utilization and CO₂, site selection and exploration, injection test, approval of underground space utilization, impact on important resources, site closure and shifting responsibility. Meanwhile, we proposed the conceptual model of evaluation on underground spaces utilization of CO₂ geological storage projects considering CO₂ plume, perturbation boundary and economic condition, and related detection technologies. Our research could provide references for the scientific planning and policy enacting of management on developing underground space as resources in the future.