The paper proposed a grouping adaptive multi-tree RFID anti-collision algorithm which divide the tags into many group based on the comprehensive analysis of variety tree-based algorithm

the tags is handled as group

the number of responding tags is reduced in the one time

thereby the probability of collision is reduced

in the same group

dynamic or dynamic quad-tree search is selected automatically according to the collision factor with using back strategy

simulation results show that the algorithm has improved greatly on the average number of queries and the amount of data transmission compared to other algorithms.