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A multicast QoS routing algorithm based on immune genetic algorithm to balance the load in the network was proposed. This paper proposes the network model which supports QoS multicast. With the optimization of existing QoS multicast routing algorithms, this paper proposes an improved multi-constrained for load balancing QoS multicast routing algorithm based on immune genetic algorithm. The simulation results indicate that the algorithm has high convergence speed and reliability, and can meets the demand of QoS multicast.