Research　purposes:　For　the　bridge　erecting　machine,　the　working　environment　is　complex,　the　safety　accidents　frequently　occur,　and　the　existing　safety　assessment　for　bridge　erecting　machine　structure　does　not　meet　the　need　of　engineering.　Through　the　field　tests　including　stress　level,　static　stiffness,　dynamic　stiffness　and　surface　corrosion　on　box-beam　structure　bridge　erecting　machine　and　truss　structure　bridge　erecting　machine,　combining　with　the　visual　examination,　the　typical　disease　of　the　two　structure　form　bridge　erecting　machines　was　purposed.　The　fuzzy　evaluation　factor　subset　was　built,　then　the　fuzzy　comprehensive　evaluation　method　was　applied　to　the　structure　safety　condition　assessment　of　the　bridge　erecting　machine.　Research　conclusions:　(1)　The　structure　state　of　existing　900　t　bridge　erecting　machine　is　not　optimistic,　the　corrosion　and　defect,　structural　deformation　and　dynamic　stiffness　fail　to　meet　the　requirement　of　national　standard,　which　need　to　be　reinforced　by　adopting　the　technique　measures.　(2)　The　phenomena　of　surface　corrosion　are　widespread　on　the　box-beam　structure　bridge　erecting　machine,　and　even　the　corrosion　penetration　is　larger　than　the　national　standard　in　some　areas.　(3)　The　phenomena　of　structural　deformation　and　bolt　fracture　occur　in　the　truss　structure　bridge　erecting　machine.　(4)　Based　on　test　results,　by　using　the　fuzzy　comprehensive　evaluation　method,　the　evaluation　factor　may　be　applied　to　the　structure　safety　condition　assessment　of　the　bridge　erecting　machine.　(5)　This　research　result　is　helpful　for　structure　inspection　test　and　condition　assessment　of　existing　bridge　erecting　machine.　©,　2015,　Editorial　Department　of　Journal　of　Railway　Engineering　Society.　All　right　reserved.