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.