Abstract: The area where the rail expansion regulator is located is the weak link of the railway line. In order to grasp the operation status of the rail expansion regulator in real time, combining with the operation demand of highspeed railway, this paper designed the health monitoring of track structure health monitoring system in rail expansion regulator area of long span bridge of high-speed railway.The system took the track structure in the rail expansion regulator area as the monitoring object, used the fiber grating sensing and visual measurement technology, and adopted the B/S mode to implement the data visualization, report generation, assessment analysis andgrading early warning of track structure monitoring.The current research results has been deployed in the Anqing Changjiang River Bridge of Ning'an Railway and Tongling Changjiang River Bridge of HeFu High-speed Railway, and provides a basis for maintenance of railway engineering department.