The　flow　patterns　and　characteristics　of　two-phase　gas-liquid　flow　in　a　90°　bend　under　different　gravity　were　simulated.　Based　on　the　VOF　(Volume　of　Fluid)　method,　a　three-dimensional　mathematical　model　of　two-phase　gas-liquid　flow　in　a　90°　bend　tube　was　established　to　analyze　the　distribution　of　flow　pattern,　the　cross-sectional　void　fraction,　the　slip　ratio　and　the　maximum　skew　angle　in　tail　of　the　gas　phase　in　a　90°　bend　under　varied　gravities　of　10-6g0,　10-4g0,　10-2g0　and　1g0　(g0　=　9.8　m/s2).　It　is　shown　that　the　effects　of　flow　patterns　and　cross-section　void　fraction　of　gas-liquid　two-phase　flow　under　varied　gravity　conditions　can　be　correctly　analyzed　by　the　developed　model　and　the　difference　of　secondary　flow　is　obtained　between　the　gas-liquid　two-phase　bend　flow　and　the　single-phase　flow.　With　the　increasing　of　gravity　level,　that　the　gas　phase　is　accumulated　to　the　inside　of　the　90°　bend　makes　the　effect　of　90°　bend　on　the　gas　phase　flow　and　the　oblique　effect　the　90°　bend　to　the　tail　get　weaken.　©,　2015,　Chinese　Journal　of　Theoretical　and　Applied　Mechanics　Press.　All　right　reserved.