In wireless mesh network，the IEEE 802.11e EDCA protocol with fixed queue-access mechanism, which makes the QoS of voice and video traffic are not guaranteed in the high load traffic, and the channel utilization is low when the network load is under-loaded .Therefore, a dynamic adjustment access queue algorithm is proposed, in which nodes could adjust their access queue according to the network load state they measured. So the proposed algorithm could improve the channel utilization while at the same time meeting the QoS demand of high-priority traffic. The simulation result shows that, the algorithm has better performance than that of the IEEE 802.11e on the guarantee of the QoS and the channel utilization under various scenarios.