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Multi-agent system (MAS) technology is adopted in constructing the model of group decision support system in distributed urban traffic management. The presented system is composed of segment agent, crossing agent, section agent and central decision agent. It can realize an intelligent traffic management, by sharing information and implementing complicated traffic control in a region. The system can achieve the global optimization of the region, alleviate traffic jam, reduce the emission of vehicles and then increase the efficiency of traffic management. The result of this paper can be used in traffic management to alleviate the urban traffic congestion in China.