The　influence　of　heat-treatment　on　the　microstructure　and　performance　of　four　kinds　of　arc　sprayed　metal　matrix　(Ni-Cr　and　304L　base)　composite　coatings　containing　TiB2　was　researched　by　use　of　scanning　electron　microscope　and　transmission　electron　microscopy.　The　results　show　that　after　heat　treatment　comprising　TiB2　Ni-Cr　matrix　coatings　have　no　obvious　improvement　on　the　porosity　and　hardness.　The　pin-on-disk　wear　experimental　results　exhibit　that　wear　resistance　of　Ni-Cr　matrix　coatings　is　increased　by　a　factor　of　2-3　by　heat　treatment.　Heat　treatment　decreases　the　porosity　and　increases　the　density　of　304L　based　MMC　coatings.　Microstructure　of　the　heat-treated　coatings　presents　nano-structured　equiaxed　grain.　The　pin-on-disk　wear　experimental　results　show　that　the　heat　treatment　could　increase　the　wear　resistance　of　coatings　by　a　factor　of　5-10.