Abstract: The existing Line 7 and newly constructed Line 13 of Chengdu metro interchange at Dongpo Road station. In this paper, the reserved interchange conditions at Dongpo Road Station on Line 7 are introduced. According to the passenger flow status and surrounding circumstances of the station, and by analyzing the attracted passenger flow volume, passenger flow organization in and out of station, interchange passenger flow organization after connecting Line 13, the original interchange scheme between two lines is optimized. The interchange form between the two lines will be changed from the simple tunnel transfer to the “＋” node transfer, aiming at the optimization and elevation of interchange functionality. By improving the layout of escalator groups in the building, the congestion problem being prone to happen in the central interchange area of the “＋” node will be solved. The passenger flow simulation verifies the rationality of the transformation scheme of Dongpo Road station.