Bridge　health　monitoring　system　(BHMS)　is　able　to　simultaneously　get　all　kinds　of　information　which　reflect　the　safety　conditions　of　bridge　structure,　and　provide　scientific　proof　for　the　analysis　of　bridge　health.　At　present,　the　BHMS　developed　only　for　specific　bridge　or　several　long　span　bridges,　and　the　monitoring　information　is　not　shared　as　a　single　island,　there　is　also　not　have　a　unified　and　integrated　monitoring　platform　from　the　urban　bridge　management　perspective.　Thus,　This　paper　analyzed　the　needs　of　urban　bridge　information　management　of　BHMS,　and　deeply　studied　on　urban　bridge　cluster　monitoring　system　design　and　implementation.　It　proposed　detailed　technology　on　remote　monitoring　subsystem,　the　network　communication　subsystem,　and　data　storage　subsystem　of　these　key　subsystems　which　easy　to　produce　performance　bottlenecks　on　the　cluster　monitoring　system.　Finally,　it　completed　the　requirements　of　the　various　subsystems　to　work　together.　Based　on　this　system　architecture　and　the　project　of　main　roads　bridge　Online　Safety　Monitoring　Management　System　in　Hangzhou　(Phase　II),　a　web-based　platform　and　open-urban　bridge　cluster　monitoring　system　have　been　established.　After　many　years　operation,　the　system　is　stable　and　reliable,　responses　under　excitation　of　Wenchuan　earthquake　are　successfully　recognized　and　the　real-time　alarming　is　thus　realized.　©　2011　IEEE.