The term of manufacturing grid (MG) is the applying of grid technologies on manufacturing, which really a cooperation platform and resource sharing system among manufacturing enterprises. Many works have done on MG architecture but most are case-bycase for the complicated of manufacturing itself. By analyze the trend of advanced manufacturing technology development and the characteristics of MG, point out that the essential of MG concept is a virtual manufacturing organization, which a combination of Data grids and Service grids. After discussing the feasibility of Service Oriented MG model and give the realization thought of SOMG, the whole architecture of SOMG is presented. In this architecture, a Peer-to- Peer node structure responsible for aggregating manufacturing resource and service by Distributed Hash Table approach. At last, the way of manufacturing services organizing is discussed too.