By　taking　the　short　and　medium　span　beam　bridge　as　an　example,　its　static　forecast　method　and　early-warning　index　system　for　bridge　safety　are　in　research.　Evaluation　criteria　and　early-warning　grade　of　bridge　technology　condition　are　put　forward.　Assessment　model　for　bridge　safety　is　set　up,　based　on　the　BP　(Back-Propagation)　Neural　Network　and　Analytic　Hierarchy　Process　(AHP).　It　makes　some　beneficial　attempt　for　establishing　a　more　serviceable　bridge　management　system.　©2010　IEEE.