Abstract: With the needs of miniature file system in the application of active RFID tag, and the characteristics of limited memory of the system, high speed of reading and writing files during the interrogator collecting tags, this paper begins the research on the secure file system for active RFID tag. It designs a compact, secure and efficient file system by selecting high-speed memory device and improves the FAT file system（adding flexible data cache mechanism, simplifying the file directory entry, adding file access control functionality）. The experimental results show that the system works well.

Key words: active Radio Frequency Identification（RFID）, File Allocation Table（FAT） file system, embedded system

摘要： 针对有源RFID标签应用中对微型文件系统的需求，围绕标签内存小和大量标签盘点过程中要求文件读写速度快的特点，展开对有源RFID标签安全文件系统的研究。最终通过选用高速存储器件和对FAT文件系统进行改进（实现灵活的数据缓冲层、精简文件目录项、增加文件访问控制），实现了简洁高效安全的文件系统设计，并在实验中展现了文件系统良好的性能。

关键词: 有源无线射频识别（RFID）, 文件分配表（FAT）文件系统, 嵌入式