When liquid CO2 is disposed into the deep sea or stored on tile sea floor in order to prevent anthropogenic CO2 from entering the atmosphere, the CO2 reacts immediately with the seawater and forms solid CO2 hydrate, In this study, growth model is proposed for CO2 hydrate layers. In addition, an estimation is shown for the CO2 concentration profile, the growth rate of the leger, and its thickness in the quasi-steady state, The simulation results indicate that the hydrate layer diminishes CO2 dissolution from the storage pool into the upper sea. This growth process is extremely sensitive to the density difference between the CO2 hydrate particles and its environmental liquid.