Abstract: This paper proposes an Ant Colony algorithm based QoS Routing (ACQR) for wireless mesh networks,focusing on optimization problem regarding to multi-constrained QoS path selection.Using ant colony algorithm,this solution dynamically constructs path set that meets the requirements in end-to-end bandwidth,delay,packet loss rate and jitter,from which a node chooses a reasonable path according to predetermined fitness function.Our simulation results demonstrate that the proposed ACQR can reduce end-to-end delay and jitter,improve delivery ratio,and provide delay and reliability guarantees for data transmission.