The　present　work　studies　the　effects　of　titanium　carbide　(TiC)　particle　additions　on　the　microstructure　and　mechanical　properties　of　hypereutectic　high　chromium　cast　iron　containing　about　20%Cr　and　4.0%C　by　the　optical　microscopy　(OM),　the　transmission　electron　microscopy　(TEM),　the　X-ray　diffraction　(XRD)　analysis,　the　digital　image　analysis　system,　impact　tester,　and　hardness　tester.　The　carbides　of　high　chromium　cast　iron　are　refined　gradually　and　the　shape　of　the　primary　M7C3-type　carbides　became　more　isotropic　with　the　increase　of　TiC　particles.　When　the　addition　of　TiC　particles　exceeds　1.0　wt.%,　the　change　of　microstructure　is　not　obvious.　The　hardness　of　high　chromium　cast　iron　has　a　slight　increase　and　impact　toughness　has　a　obvious　increase　with　the　increase　of　TiC　additions.　However,　when　the　addition　of　TiC　particles　exceeds　1.0　wt.%,　the　impact　toughness　has　no　obvious　change.