Abstract: Targeting the structural characteristics, main transfer forms and influencing factors of transfer capacity of urban rail transit T-type transfer station, the problems existing in the old transfer capacity calculation methods are analyzed. The influence of the platform passable width and the actual passing capacity of transfer facilities on the transfer capacity is discussed. The calculation method of platform passing capacity based on platform passable width is proposed, on the basis of which, a new method for calculating the transfer capacity of T-type transfer station is proposed. Finally, Nanwulibao Station of Zhengzhou Metro is taken for case research. Results show that compared with the conventional calculation methods, the new method greatly improves the accuracy of transfer capacity calculation.