Abstract: Geological storage of CO2 is one of the important methods to reduce carbon emission and greenhouse effect, and is an emerging field of earth science research. The choice of injection well site has an important impact on CO2 storage and is limited by the complexity of geological conditions and construction conditions. The choice of injection well site is a complex optimization problem. In this paper, CO2 geological storage model is constructed firstly based on geometric method and seepage theory, by which the storage capacity of the formation can be estimated combining the basic concepts of stratigraphic confinement, overflow path and overflow point. Based on this, the carbon sequestration injection well site optimization problem is transformed into a dynamic programming problem, and the optimal injection well site is determined by calculating the optimal substructure and state transfer equation. In this paper, the dynamic programming method is used to optimize the injection well site to maximize the carbon sequestration capacity, and applied to the estimation of carbon sequestration capacity and optimization of the injection well site in the Utsira reservoir in Norway to provide theoretical guidance for the selection of the well site for carbon dioxide geologic sequestration injection wells.