Abstract: Geological safety assessment is an important basis for the development of carbon storage engineering. To research the reservoir model of natural CO₂ gas can demonstrate the feasibility of carbon storage project built in the deep salt water layer. The monitoring of CO₂ leakage can be used as a demonstration for the geological safety evaluation of the carbon storage under emergency. Through using the carbon dioxide (CO₂) capture, utilization and storage (CCUS) concept, the formation, migration and accumulation model of CO₂ gas reservoir in Ping'an region of Qinghai province have been analyzed in this paper. Results show that:①the natural CO₂ gas in this region is inorganic gases. ②the high content of CO₂ gas from the intermittent high pressure flowing wells (ZK10) reveals that the mixed layer of CO₂ gas and water is contained in the cretaceous strata in eastern Qinghai. ③Minhe and Xining Groups are two sets ideal strata to storage CO₂ gas. The channel network of CO₂ gas reservoir is connected each other by secondary fracture, and the location of fracture intersection is a good development area for highly purified of mantle-derived CO₂ gas, which is also the most beneficial region of carbon storage projects in the future.