Abstract: This paper studies the dynamic traffic grooming problem in IP/DWDM optical Internet，which has been proved a NP-hard problem.Heuristic and intelligent algorithms are adopted to solve the problem.In this paper，network and mathematics models are set up，and an artificial immune algorithm is designed to route and assign wavelengths for the new-coming connection request，minimizing the cost for the request as well.In order to check the feasibility and the validity of the algorithms，a simulation environment is developed with VC++ 6.0 and several practical optical networks，such as the NSFNET，the CERNET1，the CERNET2 and the GéANT，are tested.The experimental results show that the algorithm presented here can gain better result than the current heuristic algorithm.