为解决前期轨道线网中大型商圈车站未预留换乘节点问题，研究新建地下车站与已建高架车站换乘设计的合理性。以重庆轨道交通18号线杨家坪站为例，通过分析杨家坪站周边主要控制因素，考虑与既有2号线高架车站换乘，结合设站条件、客流服务等因素对5种站位方案进行比选，形成推荐站位，进一步比选车站主体方案。最后，对非付费区换乘及付费区通道换乘（内置通道、外置通道）、“通道+厅”换乘方案进行比选，推荐18号线与2号线采用付费区“通道+厅”换乘。

If there is no transfer node reserved for large business circle stations in previous rail network, how to design transfer scheme for the newly built underground station and existed elevated station? The main control factors around Yangjiaping station of Chongqing rail transit line 18 are analyzed, and considering its transfer with the existed elevated station of line 2, five station schemes are compared based on the factors of station conditions, passenger flow service, etc.〖KG-*3〗, to select the recommended station. Then the main scheme of the station is further compared. Finally, the schemes of transferring channel in nonpayment area and payment area (including builtin channel and external channel ) and "channel + hall" transfer schemes are compared and selected. It is recommended to adopt the transfer scheme of "channel + hall" in payment area for lines 18 and 2.