针对射频识别系统中的标签碰撞问题，提出了一种基于分组策略的RFID自适应防碰撞算法。该算法在二叉树搜索算法的基础上引入分组策略、后退策略、自适应地选择四叉树搜索策略、动态调整标签碰撞检测过程策略，减少了搜索次数和读写器与标签间的通信量，提高了识别效率。-Systems for radio frequency identification tag collision problem, a packet-based strategy RFID adaptive anti-collision algorithm. The algorithm in the binary tree search algorithm based on the introduction of grouping strategies, backward strategy adaptively select quadtree search strategy and dynamic adjustment of tag collision detection process strategies to reduce the amount of communication between the number of searches and the reader and tag, improve the recognition efficiency.