A design of indoor location system based on RFID and ZigBee technology is introduced,the hardware of the positioning system is made by the second-generation system-on-chip CC2530,the RFID reader,the tags and some peripheral circuit as well.It adopts RSSI and MLEM（Maximum Likelihood Expectation Maximization） to calculate the positioning results.The location system structure and hardware circuit design are introduced emphatically,and the working principle,software process and location algorithm implementation are analyzed.The experiment illustrates that the location system can realize the function of local area positioning.%介绍了一种基于RFID和ZigBee技术的室内定位系统的设计。该设计以第二代片上系统CC2530为核心,配合RFID阅读器和标签、以及一些外围电路构成了硬件定位系统。采用基于接收信号强度值（RSSI）的定位技术和最大似然估计的计算方法进行定位。重点阐述了该定位系统的结构和硬件电路设计,分析了定位系统的工作原理、软件流程和定位算法的实现。实验证明该定位系统能够实现室内局域定位的功能。
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