The purpose of this paper is to introduce the recently development about RFID middleware from potential aspects. The RFID middleware definition is firstly presented, so as to the research scope is designated. And RFID middleware Framework's function and semantic hierarchy model is also given here. Then salient features and roles of the framework are proposed, and the key technologies and solutions are summarized, based on the study of existing frameworks' concrete implements. Finally, the framework shortcomings are discussed and the following research directions are provided.%本文从多个方面综述了RFID中间件的最新研究进展.首先给出RFID中间件的定义,确定了研究范围；然后提出了RFID中间件应具有的通用功能、语义层次关系模型；随后在对目前流行框架研究分析的基础上,总结了各类框架的显著特征及作用；同时给出了用于实现关键需求的技术和解决方案；最后还总结了目前存在的不足,展望了未来的发展方向.
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