The focus of this paper is on applying OPC UA specifications in event analysis of dispatch domain. GES information model, service interfaces used in current system and categories of dispatching events are analyzed first. Then using event model defined in OPC UA alarm and conditions specification to describe power dispatching events, and providing data access support through OPC UA event service are studied. The differences of event definition and capability of service between GES and OPC UA event services are also discussed. Based on CIM and OPC UA event categories, the address space model of event analysis application is set up. Then the event analysis application is developed to analyze events synthetically, with power grid model and event model managed in unified address space. The event analysis application conforms the OPC UA specification and the communication efficiency and security has been improved.