Abstract: A non-NP QoS multicast routing algorithm in IP/DWDM optical Internet is proposed. It is based on the bipopulation-evolution to find a cost-optimized QoS multicast routing tree of which all bandwidth, delay, delay jitter, error rate are bounded with routing and wavelength assignment solved integratedly. Simulation results show that the proposed algorithm is both feasible and effective, which not only satisfies QoS constraints but also is superior to the algorithms based on the conventional genetic algorithm, getting rid of prematurity and slow convergence, the problem of QoS multicast routing in IP/DWDM optical Internet is therefore solved effectively.