Abstract: At present, the emergency management has become a hot issue.From the knowledge need of emergency management, this paper researches the relationship characteristics of unexpected event object elements and proposes the knowledge navigation model based on event chain.This model has five parts:resources model, knowledge ontology model, emergency disposal model, event object model and event chain mo del.Through the studies on relationship between different models, we provide users with convenient, speedy and timely knowledge navigation.At last, an application example is given to present the realization process of the model.

Key words: event chain, knowledge navigation