Heavy rainfall is a common source of disasters in Taiwan. In recent years, floods have become more frequent and more severe. Therefore, there is a need for more research on Taiwanese flood preparedness. This study aims to study Kaohsiung residents¡¦ risk perception and preparation for floods, using Rogers¡¦ (1983) protection motivation theory as the theoretical model. A convenience sample of 256 residents answered the questionnaire in this study. Results found that respondents¡¦ perception of flood risk and perception of weather forecast (its timeliness, accuracy and comprehensibility) could affect their intent to prepare. These findings suggest that the government should put more effort into flood risk education and improve the quality and trustworthiness of weather forecast.