This　paper　investigates　the　efficiency　of　acoustic　emission　(AE)　technique　for　monitoring　and　assessing　the　bond　slip　behavior　and　damage　characteristics　of　deformed　rebar　embedded　in　hybrid　fiber　reinforced　engineered　cementitious　composites　(ECC).　A　series　of　pull-out　tests　were　conducted　on　48　prism　samples　with　variable　rebar　diameters　(14　mm,　20　mm,　and　25　mm),　embedded　length　(3d,　4d　and　5d),　and　cover　thickness　(2.5d,　4d,　5d　and　6d).　Two　AE　sensors,　attached　on　ECC　surface　and　rebar　surface　respectively,　were　utilized　to　critically　monitor　the　AE　activity　emitted　from　the　ECC　matrix　and　the　interface　between　ECC　and　rebar　throughout　the　tests.　The　bond-slip　behavior　of　ECC-rebar　presented　a　more　ductile　performance　than　conventional　concrete　(CC)-rebar　because　of　fiber　bridging　effect.　The　damage　classification　and　damage　characteristics　were　clarified　by　measuring　AE　activity.　The　debonding　process　of　ECC-rebar　could　be　divided　into　four　main　stages　based　on　the　slope　changes　of　cumulative　AE　hits,　and　further　refined　into　several　substages　based　on　the　sudden　rises　of　AE　energy.　Besides　AE　cumulative　parameters,　the　Ib-values　calculated　from　AE　signals　of　ECC　matrix　and　ECC-rebar　interface　were　analyzed　and　compared,　which　behaved　more　effectively　in　identifying　the　development　of　cracks　and　distinguishing　the　maximum　bond　stress.　Also,　the　AE　intensity　analysis　was　implemented　to　identify　the　micro-mechanism　transformation　during　different　bonding　stages.　Moreover,　the　AE　intensity　results　of　CC-rebar　obtained　from　previous　research　and　ECC-rebar　in　this　study　were　compared.