Due to the particular geographical location and geological condition, Taiwan suffers from many natural hazards, such as typhoons, flooding, landslides, land debris, and earthquakes, which often cause series property damages and even life losses. To reduce the damages and losses caused by the natural hazards, an integrated and complete disaster management information system is necessary. An ideal DMIS should integrate the GIS tools, internet technology, dynamic hazard models and graphical user interfaces (GUIs), and covers the operations through the four different phases which include mitigation, preparedness, response, and recovery. In the past, the relevant research fields for disaster prevention involving earthquakes, floods, debris flows, and hazard response system have been successfully studied in Taiwan. However, to better and faster manifest the results of those research fields to the real practices, an integrated information system is needed. In this paper, the framework of DMIS using GIS and internet technology is firstly described. Based on the framework of DMIS, a decision support system for emergency response (DSSER) or typhoon hazard has been developed by the Information Division of the National Science and Technology Center for Disaster Reduction (NCDR). This system is designed to integrate the real-time monitoring data, the dynamic hazard models and GUIs to provide disaster management decision support tools for emergency response. The results of disaster interpretation, analysis and prediction using this system are then provided to the National Emergency Operations Center (CEOC) for decision making and disaster management. The current framework and developing information systems of disaster management in Taiwan are also introduced briefly. Issues of system implementation and promotion and strategies to overcome the difficulties of disaster management will also be discussed. Conclusions of preliminary results and future works are also provided in this paper.