Exit signs are widely used as an indoor navigation aid, because the information conveyed by exit signs can improve wayfinding efficiency. Existing research mainly focused on signboard design or the placement of several signs in a local space. Nevertheless, to provide effective navigation assistance, exit signs of a building need to work together and form a comprehensive exit sign system to indicate an effective exit route. Few studies treated exit signs of a building as a whole system to assess their design and placement. To fill this gap, this study defines three key characteristics of an effective exit sign system: continuity, consistency, and guiding correctness, proposes the mechanism of the interaction between pedestrians and exit signs on navigation graph networks, and develops a method to check exit sign systems based on navigation graph networks. The proposed method is a workflow that follows the procedure of constructing navigation graph networks using Building Information Modelling (BIM), identifying decision-making nodes, determining the mechanism of the interaction between pedestrians and exit signs, and assessing the effectiveness of exit sign systems in terms of continuity, consistency and guiding correctness. A real case of a three-story educational building is used to validate the feasibility of the proposed method. The results indicate that the proposed method can automatically identify coverage errors, direction conflicts, and guiding direction errors in exit sign systems of buildings. This study sheds substantial light on the design of exit sign systems in buildings and provides an effective tool to help designers and engineers design new exit sign systems and benefit building managers by examining and managing existing exit sign systems.

出口标志被广泛用作室内导航辅助设备，因为出口标志所传达的信息可以提高寻路效率。现有研究主要集中在招牌设计或在局部空间中放置几个​​招牌。然而，为了提供有效的导航协助，建筑物的出口标志需要一起工作，并形成一个全面的出口标志系统以指示有效的出口路线。很少有研究将建筑物的出口标志作为一个整体系统来评估其设计和布置。为了填补这一空白，本研究定义了有效出口标志系统的三个关键特征：连续性，一致性和引导正确性，并提出了行人与导航图形网络上出口标志之间相互作用的机制，并开发了一种基于导航图网络的出口标志系统检查方法。所提出的方法是一种工作流程，该工作流程遵循以下步骤：使用建筑物信息模型（BIM）构建导航图网络，确定决策节点，确定行人与出口标志之间的相互作用机制以及评估出口标志系统的有效性。连续性，一致性和指导正确性的条款。一个三层的教学楼的真实案例被用来验证该方法的可行性。结果表明，该方法能够自动识别建筑物出口标志系统中的覆盖误差，方向冲突和引导方向误差。