Research purposes:When a new track ofurbanmass transit jointswith the existing track in a city forbeing open to traffic, its differentoperationalmodes create the different influences on station architecture design. Based on the design ofNanyuanxi Station on Daxing line ofBeijing urbanmass transi,t this paper studies the issues on calculation of the scale of junction station architecture in reasonable operationmode.
Research conclusions:(1) The reasonable operationalmodes of the station are to adopt the through transportationmode in early days and nearly days, and the sectional transportation in future. (2) For the city development in the future, the expansion possibility should be considered to the city trunk line. (3) The passenger flow of junction station is transferring passenger flow, which is impossible to occur the superpeak hours' passenger flow, so it isunnecessary to use the super peak hours' coefficient in calculation of the platform width. (4)When the amounts of the subway trains of two lines are notsame, there is the possibility that the passengers to two trains arewaiting on the same platform at the same time, so the platform should bewide enough.