Composite　cermets　with　different　mass　ratios　of　Ti　(C,N)/TiB2　and　10　wt%　FeCoCrNiAl　high-entropy　alloys　(HEAs)　binder　were　fabricated　by　mechanical　alloying　and　vacuum　hot　press　sintering.　The　effect　of　the　TiB2　content　on　the　microstructure　and　mechanical　properties　of　the　Ti　(C,N)-TiB2-HEAs　cermets　was　systematically　examined　and　is　discussed　in　detail.　The　microstructure　was　analyzed　by　X-ray　diffraction　(XRD),　scanning　electron　microscopy,　and　transmission　electron　microscopy　(TEM).　The　results　of　this　study　show　that　a　small　amount　of　Fe2B　phase　was　detected　in　the　XRD　patterns　besides　the　Ti(C,N)　and　TiB2　phase.　The　TEM　observation　shows　the　presence　of　a　HEAs　binder　phase,　which　was　tightly　bound　to　Ti(C,N)　and　TiB2　phases.　The　grain　size　of　the　composite　cermets　gradually　decreased　with　increasing　TiB2　content　increased　from　0　to　45wt%.　The　relative　density　of　the　composite　cermets　first　increased　and　then　decreased　with　increasing　TiB2　content　from　11.25　to　45　wt%.　When　the　TiB2　content　reached　22.5　wt%,　the　composite　cermets　exhibited　excellent　comprehensive　performance.　The　grain　size,　relative　density,　and　hard　phase　of　the　composite　cermets　were　the　dominating　factors　that　determined　the　mechanical　properties　with　increasing　TiB2　content.　The　relative　density,　Vickers　hardness,　bending　strength,　and　fracture　toughness　of　the　Ti　(C,N)22.5　wt%　TiB210　wt%　HEAs　composite　cermets　reached　98.86　±　0.20%,　1954.4　±　20HV10,　727　±　20　MPa,　and　7.9　±　0.1MPam1/2,　respectively.　©　2020　The　Ceramic　Society　of　Japan.　All　rights　reserved.