公交区间车的运行会影响全程车的运行状态，合理地设置区间车发车计划可提高公交系统的运行可靠性． 文中考虑区间车的运行，建立了公交的运行状态模型，采用变点理论中的累计和误差(CUSUM) 法设计区间车发车策略，并以北京市 973 路公交车刷卡数据为基础，通过数值仿真方法，研究了不同的区间车发车策略对全程车运行可靠性以及乘客平均等待时间的影响． 仿真实验结果表明: 文中提出的区间车发车策略不仅能提高公交运行可靠性，也能较大程度减少乘客的平均等待时间; 若区间车发车时刻设置不当，会对其他全程车的运行可靠性产生消极影响．

The operation of short-turn buses will affect the operation state of full-length buses． The reliability of bus operation system can be improved by properly designing a short-turn departure strategy． Given the operation of short-turn buses，a bus operation state model was established． And the departure strategy was designed with the cu- mulative sum ( CUSUM) method． In addition，based on the real-time IC data of bus No． 973 in Beijing，the influ- ence of different short-turn bus departure strategies on the operation state of full-length buses and passenger's average waiting time were studied by numerical simulation method． The simulation results show that the bus depar- ture strategy developed by this method can not only improve the bus operation reliability，but also greatly reduce the passenger＇s average waiting time; improper departure time arrangement have a negative impact on the operation reli- ability of other full-length vehicles．