Around city applications such as E-Government, E-Business, etc, event handling becomes a common activity. When handling an event in a city, people should focus on the task of integrating, conforming and scheduling heterogeneous, distributed resources from multi-domains, as well as sharing knowledge among different organizations. This paper proposes a rule-based distributed resources integrating and scheduling model for event handling. The model has a hierarchical structure with four levels: resource layer, knowledge layer, business layer and representation layer. Detail work on the knowledge layer is explored, which includes the definition of formal business rule, reference to resources in a rule, as well as the design and implementation of the rule system. Finally, an event handling prototype system of unitive alarm taking in for iEMS (integrated emergency management system) is implemented to validate the model.