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[Objective] There are some non-quantifiable factors in the actual travel of passengers in urban rail transit (such as the position of interchange stations in the line network), which are challenging to quantify and convert into impedance in the multi-route probability choice model of urban rail transit. It is necessary to study the impact of these factors on passenger route choice. [Method] According to the positions, interchange stations along urban rail transit routes are classified into three categories: near route front (forward path), in route middle, and near route end (backward path). Based on actual passenger travel data obtained from mobile signaling in Shanghai rail transit network, typical OD (origin-destination) pairs and interchange stations meeting research requirements are selected. The selection proportions calculated by the multi-route probability choice model are compared with the actual selection proportions, and the influence law of different interchange station types on passenger interchange route choice is obtained from analysis. [Result & Conclusion] Compared to interchange stations located in route middle, passengers tend to choose those located near route front or end. The actual choice proportion of routes is approximately 10% higher than the model-calculated selection proportion. When constructing a multi-route probability choice model, interchange factors shouldn′t be simply quantified and converted into impedance, rather various interchange factors should be comprehensively considered. [ABSTRACT FROM AUTHOR]