Aiming　at　the　current　problems　that　the　existing　bridge　structure　reliability　analysis　model　is　solved　slowly　and　it　is　difficult　to　find　the　global　optimal　solution　and　other　issues.　This　paper　put　forward　a　kind　of　reliability　analysis　model　of　bridge　structure　based　on　improved　simulated　annealing　algorithm,　reduced　the　computational　complexity　of　the　inner　loop　to　optimize　the　disturbance　mode,　used　adaptive　cooling　control　strategy　to　improve　annealing　process　speed,　used　the　effective　offset　to　improve　the　solving　way.　Simulation　results　showed　that　the　reliability　analysis　model　of　bridge　structure　this　paper　proposed　which　based　on　improved　simulated　annealing　algorithm　had　better　performance,　and　had　certain　feasibility　and　accuracy.　©　2014　CAFET-INNOVA　TECHNICAL　SOCIETY.　All　rights　reserved.