This research covers the environment of Jisimdo, located in Geojedo, where the investigator visited twice for this paper. It was once the military base of the Japanese navy during the Japanese colonization, and now belongs to the Ministry of National Defense. Gisimdo has a beautiful natural scenery and thus should be called as the island of ecology, history and rest. The island is located in Hallyo National Sea Park, and every year marine tourists visiting Jisimdo (one of Geoje`s Eight Spectacles) is sharply increasing. The basic elements underlying tourism development can be the advent of marine tourism, blue tourism & marine-therapy, shift of time and space in tourism behaviour, locational approach、 and so on. Gisimdo is valuable for it holds a locational pattern(land-approached island), has plentiful cultural resources, is one of Geoje`s Eight Spectacles and also is a historical and ecological region. However, Jisimdo faces difficulties in tourism development due to matters of jurisdiction. Geojesi is planning to develop Jisimdo`s tourism, but since the Ministry of National Defense is holding jurisdiction, Geojesi might fail to carry out their plan. In Gisimdo, there are fifty-two inhabitants hoping for the transfer of state property to private ownership, especially land. It is desirable that the Ministry of National Defense should respond to the problem affirmatively so that Jisimdo`s tourism does not fail.