This paper considers the problem of multicast routing and wavelength assignment in wavelength division multiplexing grooming networks without wavelength conversion capability and proposes the dynamic multicast traffic grooming algorithm.The algorithm based on the resources of current network

integrates traffic grooming and load balancing functionality simultaneously

reconfigures weight of each link dynamically

and constructs a minimum cost bandwidth guaranteed tree for multicast request.The simulation results in different network loads show the influence in terms of request acceptance ratio

average resource utilization efficiency

and distribution of loads in the network.