Abstract: For the purpose of optimizing the design of signage system in transport hub and solving the evaluation problems, this paper employed building information modeling (BIM) and virtual reality (VR) technology to conduct the research on a signage system's evaluation and optimization. During the experiment, participants' wayfinding time, wrong turns, and stopping and looking were collected. Then, the gray nearly optimal solution method was used to evaluate the comprehensive efficiency of the signage system. Results show that signage system has a significant influence on passengers' wayfinding performance. Besides, the guiding efficiency of the new signage system is higher than the old one. In the new signage system environment, wayfinding time, and stopping and looking times have a significant decrease in line 1. No significant difference is found in wrong turns. At the same time, wayfinding time and wrong turns have a significant decrease in line 2. No significant difference is found in stopping and looking. Additionally, the research proposes a general method of the signage system's evaluation based on the BIM+VR technology and passengers' spatial cognition. The research provides a basis for evaluating and optimizing signage system in other closed spaces.