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In this thesis, I classified the collisions at sea between Koryo kingdom’s naval forces and waegu, such as ‘naval warfare’ ‘surprise attack’ ‘encounter at sea’. And I analyzed these three items with three periods as follows: ① the period from the year of 1350(the invasion of the waegu of the Kyung-in started) to the september of the year of 1373. ② the period from the October of the year of 1373(the reconstruction of Koryo’s naval forces began) to the year of 1377. ③ the period from the installation of Hwatongdogam to the year of 1392. As the result, in the ① period Koryo’s naval forces were put in a defensive corner. And there was no change in the phenomenon in the ② period. But at the time of ③ period, Koryo’s naval forces which could have equipped the gunpowder weapon in their naval vessel started to search and attack waegu’s vessel. These domination of the naval supremacy by the Koryo’s naval forces had interrupted the action of securing the war materials such as rice and other crops by the waegu, that is to say, the southern court(南朝)’s power in the Kyushu(九州) area of Japan. With the attack of Kyushutandai(九州探題) Imagawa Ryoushyun(今川了俊) to the southern court(南朝)’s power in the Kyushu(九州) area, the domination of the naval supremacy by the Koryo’s naval forces in the Korean Peninsula had brought the synergistic effect. And that leaded the weakness of the southern court(南朝)’s power in the Kyushu(九州) area. That weakness meant that the last flickers of hope had being extinguished. It was a matter of time that the surrender of the southern court(南朝) of Yoshino(吉野).