The global problem of “green house effect” is in a new phase toward the international agreement on the Treaty of prevention of global warminy at the United Nations Conference for Environment and Development (UNCED) being held in June this year, though coordinations of argument between some countries is remained. Technical researches for the reduction of increasing rate of CO₂ concentration in atmosphere are also being performed in the various countries, among them LCO₂ injection into the ocean was proposed by M. Steinberg et al. in 1984 utilizing the deep ocean as a promising vast reservoir for disposal of CO₂. In their paper description is just limited to the conceptual idea of ocean disposal system not referring to the technical problems during CO₂ flow process from the pipeline inlet to the sea floor. Phenomena such as thermo-physical flow in the vertical pipeline, turbulent jet in the ocean after discharging and diffusion from the CO₂ pond on the sea floor should, however, be technically discussed before evaluation of this system. This work will be beneficial not only for the assessments of the ocean environmental control but also for the study of the ocean biological disposal system. In this paper three stages of physical behavior of LCO₂ in the ocean-non critical or saturated fluid flow and super critical pressure fluid flow in the leading pipe, free turbulent jet or plume injected into sea from nozzle and turbulent diffusion from the CO₂ pond formed on the ocean floor were discussed, and some engineering concepts were proposed according to the analyses. Auther resulted the ocean disposal system of CO₂ would be feasible as an efficient means for the atmospheric CO₂ control, provided that the well controlled hardware and LCO₂ flow were prepared. Since the theories adopted include some numerical and conceptual hypotheses deducted from normal boundary conditions and actual environment in deep sea may offer quite different conditions to the disposed CO₂, author wishes to emphasize the importance of the theoretical and empirical studies of these unveiled items.