Abstract: Considering the lack of unified description model for massive heterogeneous devices in Internet of Things (IoT), an Ontology-based Resource Description Model (ORDM) was proposed in this paper. Based on the analysis of resource characteristic, all the resources were described from attribute, state, control, historical information and privacy classes. In the application of smart office, the ORDM was implemented and applied. The experiment results show that the proposed model can support the rich access devices and business functions in IoT, which has good prospects for applicdtion.