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It's an important research direction to guarantee QoS dynamically for diverse services of next generation network (NGN), especially to guarantee their required bandwidth resource. Firstly, a general frame about NGN resource allocation was introduced. Then, a NGN bandwidth resource allocation method based on cooperative game theory was put forwarded, which adopted cooperative game constrains, modeled and solved the bandwidth resource allocating. Finally, simulation results show this method can optimize the efficiency of whole network and can guarantee every service required bandwidth simultaneously.