The simulation model of evacuation behavior from tsunami is constructed utilizing Multi-Agent-System in this study. The validity of the simulation model is verified by applying it to the case of Aonae, Okushiri Island during the 1993 Southwest-off Hokkaido Earthquake. And results of some case studies on current Aonae show that the improvement of evacuating environment affects evacuation behavior greatly, and that moving speed and earlier starting of evacuation are important parameters to minimize total mortality and missing rate.