This paper studies the integration methods of project
management (PM) system based on ontology theory. An ontology
is a collection of key concepts and their inter relationships
collectively providing an abstract view of an application domain.
Paper focuses on the methods of ontology integration for project
management system, ontology-based projects heterogeneous
database integration and local ontology construction. It also
builds an interacting architecture of project information based
ontology. Moreover, it discussed project integration application
service process based on the method of project isomeric database
integration, which includes project business process generation
part and service discovery and management integration part
based on web. Finally it gives a structure model of I3PMO(Isomeric Information Integrated Project Management based on
Ontology), which is effective for ontology creation and
integration in PM system.