In recent years, it is reported that the Koto Delta Area in Tokyo including areas whose elevation are lower than sea level has the risk of large-scale flood. In this paper, considering both inland and wide-area evacuation, we estimated the number of people who should evacuate to evacuation centers using GIS data of flood, population distribution and building inventory. And then, we evaluated the capacity in each area and the possible use of existing buildings as additional evacuate centers. Finally, we discussed necessary approaches to prepare appropriate evacuation centers.