Metal　materials　are　widely　used　in　aircraft,　crane　and　other　major　equipment.　Under　the　combined　effects　of　medium,　temperature　and　cyclic　load,　metal　structures　are　prone　to　corrosion　cracking　and　cracks,　which　can　cause　structural　failures　and　even　lead　to　major　safety　accidents.　This　paper　carries　out　research　on　structural　damage　monitoring　based　on　acoustic　technology.　For　the　crack　initiation,　expansion　and　other　active　defects,　the　optical　fiber　technology　and　acoustic　emission　technology　are　integrated　and　innovative,　and　an　acoustic　emission　monitoring　system　based　on　optical　fiber　transmission　is　developed　to　achieve　long-distance　transmission　of　local　damage　signals.　In　view　of　the　damage　of　the　metal　plate　and　shell　structure,　ultrasonic　Lamb　wave　monitoring　technology　based　on　the　reconstruction　algorithm　for　probabilistic　inspection　of　damage　is　studied.　The　difference　between　the　damage　signal　and　the　reference　signal　is　used　to　identify　and　reconstruct　the　damage,　to　realize　the　monitoring　and　evaluation　to　the　damage.　Experimental　results　show　that　acoustic　emission　monitoring　technology　based　on　optical　fiber　transmission　can　identify　the　initiation　and　propagation　of　damage,　and　ultrasonic　Lamb　wave　monitoring　technology　can　identify　and　reconstruct　the　damage　of　metal　plate　shell　structure　more　accurately.　These　two　acoustic　monitoring　technologies　can　provide　technical　support　for　engineering　applications　of　metal　structure　damage　monitoring.　©　APWSHM　2018.　All　rights　reserved.