The on-site training for high-school students in the Takehara Marine Science Station of Hiroshima University roused their interest of the sea. Especially, anatomy of fishes, animal collections from the uninhabited island, and generating experiment of sea urchin were the most popular among students. As a result of this training, understanding and the interest of marine organisms and environments in almost all students have increased, so the on-site training might be effective in the prevention of high school student's losing interests in science.