When natural disasters such as earthquakes happen, network architectures are highly vulnerable. Once the network connections cannot be guaranteed, even rescue operations are difficult to carry out. in this article, to help the people in affected areas retrieve network services, we come up with a solution based on fog computing to quickly deploy emergent distributed service. in case the original network infrastructures are damaged to varying degrees, we make use of the available equipment including routers and mobile devices as fog nodes to realize emergency networking and communication. in the simulation evaluation, we compare our method with existed one. The results show that our method can reduce time costs on fast deployment and improve work efficiency.