Cross-line trains,as a link between high-speed and conventional rail networks,will increase the complexity of transport organization and lead to significant challenges in dispatch coordination between the two systems.Based on the characteristics of high-speed transport organization,this paper deals with the necessity of dispatch coordination between high-speed and conventional lines from the following two perspectives:the operation of cross-line trains and work coordination in connection stations.An adjustment model for the operation of high-speed trains,taking cross-line trains into account,is established.Finally,the dispatch system is described in terms of construction and process.Methods for organizing dispatch are proposed,and the processes of coordination adjustment under normal and unexpected situations are analyzed.The discussion in this paper may serve as a theoretical basis for the development of high-speed rail dispatch systems. Cross-line trains, as a link between high-speed and conventional rail networks, will increase the complexity of transport organization and lead to significant challenges in dispatch coordination between the two systems. Based on the characteristics of high-speed transport organization, this paper deals with the necessity of dispatch coordination between high-speed and conventional lines from the following two perspectives: the operation of cross-line trains and work coordination in connection stations. An adjustment model for the operation of high-speed trains, taking cross-line trains into account, is established. Finaally, the dispatch system is described in terms of construction and process. Methods for organizing dispatch are proposed, and the processes of coordination adjustment under normal and unexpected situations are. The discussion in this paper may serve as a theoretical basis for the development of high-speed rail dispatch systems.