Network　congestion　has　become　one　of　the　main　problems　in　bufferless　NoC,　which　not　only　degrades　system　throughput　but　also　limits　network　scalability.　Prior　works　only　throttle　the　applications　with　high　network　intensity,　incapable　of　controlling　network　congestion　accurately.　In　this　paper,　we　propose　a　DAT　congestion　control　mechanism　for　bufferless　NoC,　which　determines　the　throttle　sources　quickly　using　distributed　deflection　monitor　tables　to　record　the　deflections　of　network　packets.　And　DAT　takes　network　utilization　into　account　when　adjusting　the　throttling　rate.　Our　evaluations　show　that　DAT　can　reduce　the　deflection　rate　by　8.6%　on　average　in　a　simulated　16　core　system　compared　to　baseline　bufferless　NoC　with　good　scalability　and　low　hardware　cost.　©,　2015,　Institute　of　Computing　Technology.　All　right　reserved.