为了实现城市交通信号协调控制的精细化，协调对象的选取不应停留在子区层面，而需要进一步细化到有向路径连线上。文中通过定义协调路径、协调路径链与协调路径集，以及构成路径链的父路径与子路径，建立了一套可以反映协调控制方向性需求的概念体系，并分析了路径链的计数方法。针对路网中车辆的轨迹分布，从路径链经过的交叉口数量（路径链长度）和所承载的交通流量的角度出发，分别制定了相应的协调路径集优选法则与流程。算例分析结果表明，文中方法能够根据拟协调的交叉口数量和行驶路径流量，选出控制区域内流量较大的主要路径链，从而进一步丰富控制子区与交叉口群的划分理论。

To achieve the refinement of urban traffic signal coordination control, the selection of coordinated object should not just focus on the subarea, but needs to be further refined to the attachments of direction paths. In this paper, first, a concept system reflecting the directional demand of coordination control was established by defining the coordination path, the coordination path chain and the coordination path set, as well as the parent path and sub path which constitute the path chain. Then, the counting method of path chains was analyzed. Moreover, according to the trajectory distribution of vehicles in the road network, the corresponding optimization rules and processes of coordination path set were established from the perspective of the intersections number (namely the length of the path chain) and the traffic flow carried by the path chain. The results of example analysis show that the proposed method can select the main path chains with large flow in the control area according to the number of intersections to be coordinated and the flow of traffic path, which can further enrich the division theory of control sub area and intersection group.