Abstract: This paper presents the general situation on the geological and geochemical characteristics of CO₂ pools,their forming condition and distributions as well as their controlled geological-tectonic environments.The degassing experiment of volcanic rocks in Songliao Basin presents the CO₂ releasing parameters for different types of volcanic rocks.Geochemical modeling calculation of CO₂ releasing has been done based on dynamic metamorphism caused by ductile-brittle shearing deformation.The amount of CO₂ releasing is calculated and its relative calculation model is proposed during the contact metamorphism in carbonate rocks.Based on research,the model for the calculation of CO₂ degassing and formation of CO₂ pools under the condition of degassing from volcanic rocks,dynamic and contact metamorphism have been established.The distributions of CO₂ pools and their exploration localities in China have also been proposed.