The　fatigue　damage　process　of　SiC　coated　needled　C/SiC　composite　specimen　was　monitored　by　acoustic　emission　(AE)　under　tension-tension　cyclic　loading.　By　analyzing　the　collected　AE　parameters　of　the　composite,　it　is　found　that　Kaiser　effect　enhances　with　the　increase　of　stable　cycles　in　the　fatigue　process.　Moreover,　multivariate　K-means　cluster　analysis　of　AE　parameters　was　carried　out　after　the　standardization　of　energy,　amplitude,　peak　frequency　and　duration　of　AE　signal.　By　comparing　the　objective　function　values　of　different　number　of　clusters,　and　referring　to　the　intra　group　variance　and　the　variance　between　groups,　the　damage　modes　of　the　needled　C/SiC　composite　are　finally　divided　into　four　clusters,　and　the　characteristics　of　AE　parameters　with　different　damage　modes　can　be　obtained.　Furthermore,　by　referring　to　the　microstructure　characteristics　of　needled　C/SiC　composite,　various　damage　modes　at　different　fatigue　stages　were　analyzed.　In　addition,　the　fracture　morphology　of　the　specimen　was　also　observed　by　scanning　electron　microscope　after　fatigue　fracture.