Smart grid badly needs infrastructure that is dynamic and flexible to realize the interaction between customer and electric utility. The service-oriented advanced metering infrastructure using a distributed peer to peer（P2P） model based on the open service gateway initiative（OSGi） platforms is presented. According to this P2P model for OSGi platforms， multiple OSGi platforms are distributed in the smart grid. In each OSGi platform， a Web service bundle is deployed to publish its services and enable other OSGi platforms to utilize these services. The major benefit of using the Web services standard is that it provides interoperability between OSGi platforms and non-OSGi platforms on Web worldwide. Finally， a test system for demand response is taken as an example for proving the feasibility of the design idea of the platform.