Abstract Towards the realization of plant enterprise engineering environment (PEEE), the construction of the plant model is essential to understand and to manage the plant lifecycle activities. This paper demonstrates a technique to construct a plant model on the basis of object-oriented approach. The plant design model is represented using unified modeling language (UML). The hydrodesulfurization (HDS) plant is used as a case study where the piping and instrumentation diagram (P&ID) of the HDS plant process has been represented as composed of control group units (CGUs) connected to each other via connection points (CPs). An object-oriented modeling tool is used as a repository to construct the plant model.