Recently, the frequency of large natural disasters in Taiwan is increasing, testing the disaster management ability of Taiwan government. The Emergency Management Information System (EMIS) integrating disaster information of central and local agencies had been established by the Executive Yuan in 2007, however, every report about Typhoon Morakot 2009 indicates that the existing disaster information mechanism in Taiwan still needs improvement. With the development of civil society and Web 2.0, private NGOs and social media have gradually become important private disaster system worthy to be well-used for better disaster relief results.