Abstract: With the rapid advancement in China’s tunnel engineering field,timely monitoring and detection of the early location and size of damages in surrounding rock is an important proposition for the sustainable development of modern structural engineering.Tunnel surrounding rock is regarded as a strong scattering medium due to factors such as pore space and textural development,and traditional detection methods have limitations in monitoring early minor disturbances.The coda wave interferometry technique sensitive to multiple scattering media is used as the main research tool,and the propagation patterns of coda waves under different conditions of surrounding rock are investigated through simulation.A Python script is developed to simulate the scattering model of the surrounding rock.The study explores the propagation patterns of coda waves under various scenarios,including sensor position optimization,local damage in the model,and local failure of the support structure.The two-dimensional inversion imaging is carried out using sparse reconstruction algorithm,and compared with ultrasonic direct wave inversion results.The objective of early monitoring and localization of damage in the anchor support system is achieved.