A　three　dimensional　finite　element　modal　was　established　to　analysis　the　welding　residual　stress　of　hybrid　steel　U-rib　stiffened　plate　under　different　conditions.　In　this　paper,　a　welding　residual　stress　simulation　method　which　was　verified　by　large　number　of　experiments,　was　used　to　identify　the　influence　of　thermal　conductivity,　specific　heat　capacity,　density,　modulus　of　elasticity,　Poisson　ratio　and　coefficient　of　thermal　expansion　to　the　distribution　of　the　plate　residual　stress,　respectively.　The　analysis　results　show　that　the　coefficient　of　thermal　expansion　and　Poission　ratio　have　very　little　influence　to　the　residual　stress;　the　modulus　of　elasticity　and　thermal　conductivity　have　most　important　influence;　and　the　specific　heat　capacity　and　density　have　the　moderate　influence.　As　a　result,　the　elastic　modulus　and　thermal　conductivity　should　be　paid　more　attention　in　the　welding　residual　stress　numerical　simulation　on　the　hybrid　steel　U-rib　stiffened　plate　in　order　to　get　the　correct　values.　©　2016,　Harbin　Research　Institute　of　Welding.　All　right　reserved.