Solving difficulties in kernel technologies are the critical issue in developing Internet of things (IoT). The technologies related to IoT, such as RFID, wireless sensor network and semantic grid; as well as by margining multiple key technologies to solve difficult applicable problems are researched in focus. Semantic grid integrates the machine readable of semantic Web and powerful computing capability of grid technology; and semantic P2P technology solves the communication bottleneck due to information overload. These make the deployment of sensor nodes easier and the sensor network can be expandable. Information semantic interaction and sharing in IoT are implemented by adopting ontology technology; this makes proper and prompt understanding of the information in IoT.%物联网发展的关键在于解决核心技术中存在的难点.重点研究了RFID、无线传感器网络和语义网格等物联网关键技术,采用融合多种关键技术解决了物联网应用难的问题.语义网格融合了语义Web机器可阅读和网格技术强大的计算能力；语义P2P技术解决了信息过载通信瓶颈问题,大大方便了传感器节点的部署以及传感器网络的扩展；采用本体技术实现了物联网中的信息语义的交互和共享,为物联网中信息的及时、无歧义理解提供了便利.
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