Taking　the　subway　tunnel　in　Urumqi　crossing　Xishan　reverse　active　fault　as　an　example,　a　three-　dimensional　elastic-plastic　finite　element　model　of　soil-tunnel　structure　was　established　to　simulate　and　analyze　plastic　strain　development　process　of　secondary　lining,　transverse　and　longitudinal　distribution　of　tensile　damage　factor,　compressive　damage　factor　and　shear　strain,　calculate　the　crack　width　of　concrete　under　the　action　of　reverse　fault　dislocation.　Then　the　damage　law　of　the　tunnel　structure　with　different　dislocation　displacements,　different　vertical　distances　from　tunnel　bottom　to　the　interface　of　surrounding　rocks　and　different　widths　of　fault　zone　was　studied.　Finally,　the　disaster　reduction　effect　of　the　flexible　joint　was　studied.　Results　show　that　the　damage　of　secondary　lining　first　appeared　in　the　vault,　then　the　bottom,　and　finally　accumulated　at　the　waist.　The　shear,　tensile　and　compressive　damage　all　appear　at　the　tunnel　waist　of　the　rupture　surface.　When　the　tunnel　structure　is　away　from　rupture　surface,　the　tensile　damage　appears　at　the　tunnel　vault　of　hanging　wall　and　invert　of　fault　zone,　the　compressive　damage　appears　at　the　tunnel　invert　of　hanging　wall　and　vault　of　fault　zone.　The　severe　and　slightly　tensile-crack　damaged　length　are　10　m　and　30　m　respectively　based　on　the　crack　width　of　concrete.　The　larger　the　fault　displacement　is,　the　more　serious　the　structural　damage　is.　The　larger　the　vertical　distances　from　tunnel　bottom　to　the　interface　of　surrounding　rocks,　the　thicker　the　soil　is,　resulting　in　that　more　energy　is　dissipated　and　the　structural　damage　is　lighter.　The　damage　to　tunnel　increases　with　the　increase　of　width　of　fault　zone,　but　when　the　width　increases　to　26　m,　the　influence　of　width　of　fault　zone　on　tunnel　damage　becomes　stable.　Setting　flexible　joints　can　significantly　reduce　structural　damage　and　substantially　meet　the　design　requirements　for　fault　displacement.　©　2020,　Editorial　Department　of　Journal　of　Hunan　University.　All　right　reserved.