Blockage by ice floes and freezing of the seawater in ports along the coast of Hokkaido that freezes over in winter have serious economic impacts on various industries such as shipping and fishing industries. Otsu Fishing Port, located on the Pacific coast in eastern Hokkaido, is one of the ports in Hokkaido in which the water freezes every winter. The mechanism by which the water in Otsu Fishing Port freezes was found that the water freezes as a result of the accumulation of frazil ice on the quay side due to the effect of northwesterly winds. It seems that a method for controlling the movement of frazil ice would be the most effective method for preventing freezing of the water in Otsu Port.In this study, we carried out experimentsin the laboratoryt o test the effectiveness of a method for controlling the movement of frazil ice using an ice boom.