A system of CO2 disposal, in the form of CO2 clathrate, in the deep ocean has been proposed in order to prevent the green house effect caused by increase of CO2 in the atmosphere. A process consisting of both the production of CO2 clathrate and its in-situ consolidation is proposed for applying to the above CO2 disposal system as an efficient process to obtain faster sedimentation of CO2 clathrate blocks in the ocean and to prevent adverse environmental effects in the deep ocean. The process is experimentally analyzed and evaluated. It was confirmed that the CO2 clathrate block is formed in the in-situ consolidation vessel through Compressing the CO2 clathrate powders produced in the reaction vessel. Furthermore, it was confirmed that the clathrate block settled smoothly in artificial sea water under deep ocean conditions and that the process is one suitable method for application to the system. In addition, analysis of the consolidation mechanism was performed for the CO2 clathrate. And it was found that consolidation proceeds via two step, i.e., the first one at low pressure shows the decrease in the spacing volume between the colonies consisting of CO2 clathrate powders with pressurizing, and the second one at high pressure shows the breaking down step of the colonies, The boundary pressure between the first and second steps is ca. 2.3 MPa. Also, the dissolution rate of CO2 clathrate block was measured CO2-free artificial sea water and the rate was ca. 1.9 m/s at maximum.