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In order to ensure the smooth operation of urban road network traffic flow and the reasonable distribution of traffic flow in each road section, an optimal traffic route planning method based on variable-structure dynamic BN was proposed. This method considers driver preferences,establishes a variable-structure discrete dynamic BN model for traffic path planning according to time series.The maximum likelihood estimation algorithm and the adaptive parameter generation algorithm are used to learn the network parameters,and the fixed window width method in the dynamic BN approximate reasoning algorithm based on time window is used for on-line reasoning.Simulation with an example and the proposed method is compared with Dijkstra algorithm. The experimental results show that Variable- Structure Discrete Dynamic BN can make use of real-time collected information to update the optimal path in real time, online decision-making.