ACC　(air　cooled　condenser)　is　widely　used　in　coal-fired　power　plants.　It　has　the　advantages　of　water　saving　and　energy　saving,　and　the　system　is　simple.　The　fan　bridge　is　an　important　part　of　the　ACC.　At　present,　the　vibration　problem　of　the　fan　bridge　is　very　much,　and　the　experimental　data　of　the　bridge　vibration　is　single,　and　the　fundamental　vibration　source　problem　is　not　revealed.　Therefore,　it　is　important　to　study　the　vibration　causes　of　the　wind　turbine　bridge.　This　paper　analyzes　the　possible　causes　of　vibration　of　the　fan　bridge.　Through　the　combination　of　field　test　and　theoretical　analysis,　the　main　causes　of　bridge　vibration　are　analyzed.　Research　shows　that　air　disturbance　is　the　main　cause　of　bridge　vibration.　The　research　results　provide　basis　for　bridge　design.　©　Published　under　licence　by　IOP　Publishing　Ltd.