The　purpose　of　this　paper　is　to　investigate　the　mechanical　behavior　of　the　buried　steel　pipeline　in　clay　subjected　to　the　reverse　fault　movement　based　on　three-dimensional　nonlinear　finite　element　simulation　of　the　soil-pipe　interaction　system.　Based　on　the　numerical　study　of　the　influences　of　different　fault　dip　angles　and　internal　pressures　and　pipe　diameter-thickness　ratios　on　the　behavior　of　the　pipeline,　three　typical　failure　modes:　tensile　failure　of　pipeline,　local　buckling　and　excessive　deformation　of　cross　section　were　identified　and　the　corresponding　critical　reverse　fault　displacements　were　obtained　in　this　study.　The　numerical　results　show　that　when　the　fault　dip　angle　is　75°,　the　pipeline　suffer　local　buckling　failure　with　the　smallest　reverse　fault　movement,　indicating　that　75°　is　the　most　unfavorable　dip　angle.　Moreover,　large　internal　pressure　can　effectively　reduce　the　excessive　cross-sectional　deformation　of　the　pipeline.　With　the　increase　of　internal　pressure,　the　critical　failure　mode　of　the　pipeline　changes　from　local　buckling　to　tensile　failure　of　the　pipeline.　Finally,　increase　of　the　diameter-thickness　ratio　of　the　pipeline　can　significantly　improve　the　performance　of　the　pipeline　subjected　to　reverse　fault　movement.　©　2022,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.