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Urban rail transit is a new type of rail transit, between railway and urban rail transit, mainly used to solve the traffic problems between cities. By using the urban functional network model, this paper analyzes the complementary coefficient changes of Guangzhou, Zhuhai and Macao before and after the completion of urban rail transit in Guangdong Province. Through quantitative data, it intuitively shows the objective changes brought by urban rail transit to urban planning and development, and also brings development space for urban tourism economy, and deepens the economic ties between cities.