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Smart grid can apply Internet of Things (IoT) technologies for creating various intelligent services. In this paper, the basic requirements of the smart grid in China are reviewed. The development of most aspects of the smart grid would be enhanced by the applying the technologies of IoT. The architecture of IoT for the smart grid in China is introduced, which can be expressed as three layers: the perception layer, the network layer and the application layer. Various information and communication techniques of IoT applied on smart grid is discussed. Particularly, the IoT application solutions are provided in detail for power transmission line monitoring, smart patrol, smart home and electric vehicle management.