Intermetallic　NiAl-Ta-Cr　coatings　were　sprayed　by　the　HVOF　process.　The　effects　of　the　spray　parameters　(including　spray　distance,　oxygen　and　fuel　flow　rate　etc.)　on　the　microstructure　and　properties　of　coatings　were　investigated.　Metallographic　investigations　and　porosity　measurements　of　the　coatings　were　carried　out　by　optical　microscopy.　The　oxygen　content　of　the　coatings　was　measured　by　the　LECO　TC316　gas　extract　equipment.　The　results　show　that　both　the　oxygen　flow　rate　and　the　spray　distance　can　significantly　influence　the　properties　of　the　coatings.　The　oxygen　content　in　the　coatings　decreased　with　increasing　the　spray　distance.　A　high　O/H　ratio　led　to　a　high　degree　of　oxidation,　a　low　porosity　and　more　deposition.　The　coatings　showed　a　homogeneous　and　dense　structure,　less　porosities,　and　lower　microhardness　after　heat-treated　in　a　vacuum　furnace　at　1100　degrees　C　for　4　h.　A　continuous　Al2O3　oxide　scale　formed　on　the　surface　of　the　coatings　after　the　heat　treatment　at　1100　degrees　C　for　100　h.　However,　the　microhardness　of　the　coating　slightly　decreased　as　compared　to　that　after　vacuum　annealing.