Various　factors　are　involved　in　bridge　scheme　optimization,　and　it　is　difficult　to　judge　the　advantages　and　disadvantages　of　a　bridge　structure　type　by　using　just　one　index.　A　comprehensive　evaluation　indicator　system　for　bridge　structure　optimization　is　established,　with　functional　requirement,　economic　factor,　landscape　function　and　construction　curing　as　the　criteria,　and　each　factor　comprising　several　evaluation　objects　(7　in　total).　The　improved　three-mark　AHP　is　employed　to　make　it　easier　for　experts　to　confirm　the　comparison　matrix.　With　the　comparison　matrix,　one　can　get　the　weight　of　the　indicators　based　on　the　characteristics　and　function　of　the　bridge　by　the　means　of　the　improved　AHP　and　expert　evaluation,　and　thus　identify　the　rational　bridge　structure.　By　comparing　with　gray　theory　and　fuzzy　mat　hematics　method,　it　may　be　concluded　that　the　comprehensive　evaluation　indicator　system　is　rational　for　bridge　scheme　optimization.