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The exploration in the grid technology and semantic Web service promotes the development of modern manufacturing technology. Grid applications need resources and services to be discovered quickly and efficiently. The greatest obstacle we have, however, lies in the difficulties in appropriately describing resources and services. To easily find the needed services, ontology is used to describe resources and services in our Manufacturing Grid (MG) architecture. We extend UDDI in order to enhance the precision of service discovering through embedding service category ontology into service descriptions. In addition, the extended UDDI can support service publishing and service retrieving. We built a prototype to implement resource description based on ontology in MG.