Abstract: The technology of deformation control by radial grouting in large-section and weak surrounding rock tunnel is studied to provide reference for similar tunnel design and construction. Based on the investigation of different grouting schemes used in tunneling, the working mechanism of radial grouting is analyzed, the grouting plan and implementation is expounded and the effect of grouting is explained by monitoring measurements, taking the surrounding rock deformation control of the land section of Xiamen Xiang' an Sub-see Tunnel as an example. The radial grouting behind the initial supporting structure can improve the performance of the surrounding rock, enhance the close contact degree of surrounding rock with the initial supporting structure, and heighten the bearing and stabilization capacity of the surrounding rock. As a result, the deformation of the initial supporting structure is effectively controlled.