This paper introduces the concept of system of systems and attempts to apply it to China's emergency management. Based on the characteristics of system of systems, we provide some principles and concerns for the design of an Emergency Management System of Systems (EMSoS) in China. Three figures representing the EMSoS structure are presented to illustrate the design and operation of emergency supply reserve centers, synergism of resources in the operation of the EMSoS, and the early warning system for emergent events. The research also proposes a concept of seamless rescue by coordinating government and non-government organizations, as well as other available civil resources. We conclude this paper by suggesting some possible problems and challenges in the design of EMSoS in China.