Four　kinds　of　TiB2　particles　enhanced　metal　matrix　composited　coatings　(MMC)　were　prepared　by　cored　wires　produced　with　addition　of　pretreated　TiB2-based　ceramic　powders　and　arc　spraying.　Microstructure　of　arc　sprayed　NiCr-TiB2,　304L-TiB2,　NiCr-TiB2/Al2O3　and　304L-TiB2/Al2O3　coatings　were　detailedly　investigated　by　optic　microscope,　scan　electron　microscope　(SEM)　and　transmission　electron　microscope　(TEM).　Experimental　results　showed　that　metallic　phases　in　MMC　coatings　were　typical　column　crystal　that　presented　rapid　solidification　microstructure　characteristics,　and　dislocation　existed　in　matrixes.　The　coatings　presented　similar　lamellar　structure,　but　ceramic　particle　shape,　distribution　and　bonding　with　metallic　phase　exhibited　differences.