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Providing QoS support is crucial to guarantee effective transportation of multimedia service for ad hoc network. In this paper, a QoS multicast routing algorithm with bandwidth and delay constraints was proposed. It utilizes genetic algorithm to search optimized multicast tree which satisfies the QoS requirement. The simulation results show that the algorithm has fast convergence and high routing discovery rate. It will provide an available approach for multicast communication with QoS guarantee in mobile networks.