Context-aware technologies have attracted the attention of researchers in various domains, such as e-learning, the semantic web, and web intelligence. Generally speaking, contextual information can come from many resources, and the problem is that it is very difficult to integrate it into a single system or to exchange it between systems. Ontology may be able to solve this problem by describing and sharing particular domain knowledge and building a context-aware system. In this paper, an efficient ontology system called the intelligent project management system (iPMS) is proposed. The proposed system uses the web ontology language (OWL) to build contextual information and the corresponding rules. In addition, the Jena reasoning engine and OWL are used to deal with emergent events automatically. As a result, iPMS can provide an intelligent project management service.