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With rapid development of computer technology emergency system plays an important role in mitigating, rescuing of disasters and recovering after disasters, it receives more and more attention in academy and engineering. Nowadays, emergency systems have been widely employed in many fields. However, there are some shortcomings in the development and application of emergency system for it is still not perfect. This paper reviews developments of emergency system and it discusses how to design emergency system based on GIS (geographic information system) and service-oriented architecture, describe related technologies in details.