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This paper designs and implements an automatic network system utilizing UPnP, wireless network and power line carrier technology. We connect home media device and home gateway device via wireless network to build media service subsystem, and connect home applications and home gateway via power line carrier network to make power control subsystem. Then we convert both subsystems into UPnP virtual devices, which can be searched and discovered with GENA protocol. Besides, we implement an UI component with player and UPnP control point component, which can interact with media server and power management server in home gateway. The software development realizes modular design based on an UPnP application framework.