Abstract: Objective: To guide dispatch personnel through onsite fault resolution, enhance dispatch command decisionmaking efficiency, fault handling capability, and response time, it is essential to research the visualization of urban rail transit ontrack vehicle fault information. Method: The research challenges on visualization of ontrack vehicle fault information are discussed, including judgment of fault display accuracy and high requirements for information system network transmission. Taking three rail transit lines in Xiamen City as research objects, the functionality of the comprehensive monitoring system is analyzed. A visualization scheme for ontrack vehicle fault information based on comprehensive monitoring system is proposed. The scheme is expounded from aspects including synchronized transmission of train fault information, addition of train fault handling guidance system, improvement to vehicle and signal screen replays, and optimization of onboard CCTV (closedcircuit television). Result and Conclusion: Result and Conclusion: The visualization system for ontrack vehicle fault information based on comprehensive monitoring system can achieve realtime monitoring of critical faults and key train status information via wireless communication system according to different fault levels. This intelligent monitoring management ensures safe and reliable train operation, efficient fault resolution, and informed decisionmaking.