Although there is the possibility that the east coast area in Gangwon Province, Korea may be hit by Tsunami, over 7.5 magnitude, occurred in the west coast, Japan, the large development plan has been on the increase recently. Therefore, the disaster occurrence has been expected and many studies concluded that it is necessary to explore the solution concerning disaster reduction against the Tsunami. According to the result of a survey, 1) 73.8% of specialists questioned said that the disaster preparedness plan is required, especially over 94% of the members, the Pre-Disaster Impact Assessment Review Deliberation, expressed the same opinion. 2) 68.2% of people suggested that the disaster prevention forest should be made in the coastal area as the prevention policy, 68.2% of specialists said that disaster prevention facilities against the tidal wave is required, 55.1% of the people questioned said that the breakwater is needed. These are very important facts to set the priority criteria for decision making on the disaster reduction in the east coast area in Gangwon Province, and the coastal disaster prevention forest should be considered first because of the effectiveness of disaster reduction and buffer zone against the Tsunami before the large development plan is launched in this area.