Abstract: With the continuous improvement of China's economic development level, the pressure of transportation in various cities is rising. It is a priority to develop the urban public transport system and study the optimization of the bus routes. In this study, based on the data of existing bus lines and stations in qilihe district, lanzhou city, a bus line optimization model is established, aiming to reduce the travel time and the transfer times of passengers. The restrictions of route length, route non-linear coefficient, route repetition coefficient, transfer coefficient and station distance are selected as constraints. According to the final research results, the optimization measures for the existing bus lines and stations in qilihe district of lanzhou city are put forward. The suggestions are to extend 10 short routes and remove the bus stations with small spacing.

Key words: Bus route optimization; Transfer coefficient; Bus stations; Bus station distance; Passenger demand

摘要： 随着我国经济发展水平的不断提高，各个城市的交通出行压力也在不断上升。优先发 展城市公共交通系统并研究如何优化公交线路成为首要问题。文章以兰州市七里河区现有公 交线路和车站数据为基础，建立公交线路优化模型，选取线路长度的限制、线路非直线系数、 线路重复系数、换乘系数、站距为约束条件，旨在减少乘客出行时间和换乘次数。根据最终 的研究结果，提出了对于兰州市七里河区现有公交线路和站点的优化措施。建议延长线路较 短的 10 条线路，移除间距小的公交站点等。

关键词: 公交线路优化；换乘系数；公交站点；公交站距；乘客需求