This　paper　focused　on　the　develop　trend　of　reliability　index　of　members　considering　the　uncertain　factors　in　future　service　period,　and　in　the　effort　to　predict　lifetime　of　H-shaped　steel　beam　with　corrosion.　This　paper　proposed　a　method　that　uses　Monte　Carlo　method　and　Weibull　model　to　calculate　the　reliability　prognosis　of　H-shaped　steel　beam　with　corrosion　on　existing　test　data　and　research　results.　More　specifically,　the　Monte　Carlo　method　was　firstly　used　to　calculate　the　reliability　of　corroded　H-shaped　steel　beam　in　different　corrosion　time;　simultaneously,　Weibull　model　was　utilized　to　fit　the　forecast　curve　of　reliability;　the　proposed　forecast　curve　was　then　used　to　predict　lifetime　of　H-shaped　steel　beam　based　on　the　set　structural　reliability;　finally,　a　numerical　example　was　conducted　to　verify　the　effectiveness　of　the　proposed　method.　The　results　showed　that:　Weibull　model　was　able　to　effectively　simulate　and　predict　the　reliability　index　of　corroded　H-shaped　steel　beam;　according　to　the　reliability　index　attenuation　model　of　corroded　H-shaped　steel　beam,　the　lifetime　of　H-shaped　steel　beam　with　corrosion　in　this　paper　was　27.18　year.　Consequently,　the　proposed　method　can　predict　the　lifetime　of　H-shaped　steel　beam　with　corrosion,　therefore　the　feasibility　and　effectiveness　of　this　proposed　method　was　proved.　©　2016,　Editorial　Office　of　Journal　of　Shenyang　Jianzhu　University　(Natural　Science).　All　right　reserved.