In the case that the traffic resource is limited

making the analysis and optimization to the urban traffic network is the only way of enhancing the efficiency of traffic resource

and relieving the urgent situation of urban traffic in the largest extent.Under the theory of complex network

the urban traffic network of Taiyuan is studied

and the different ways of building the models of urban traffic network in large cities is explored.And it is proved that the urban traffic network of Taiyuan city is a scale-free network from the macro angle.Through the research

it is proposed that the strategy to optimize the central environment of urban traffic network of Taiyuan city and the main traffic line from South to North of Taiyuan city.