Micro-plasma　spraying　was　used　to　fabricate　HA　coatings　on　Ti-6Al-4V　substrate.　The　coating　phase　distribution　significantly　changed　throughout　the　coating　depth.　Crystalline　HA,　ACP　and　beta-TCP　were　observed　near　the　coating-substrate　interface.　However,　HA　content　increased　with　increasing　distance　from　interface,　and　it　was　similar　to　90%　at　top　surface　of　the　coating　(＞　40　mu　m)　according　to　micro-Raman　analysis.　Columnar　structure　was　found　in　such　region,　which　was　related　to　a　strong　(002)　crystallographic　texture.　In　addition,　dissolution　behavior　of　the　coating　was　evaluated　by　immersing　the　material　in　balanced　salt　solution　for　14　days.　The　study　revealed　that　HA　coating　exhibited　superior　chemical　stability,　and　the　columnar　structure　emerged　on　the　surface　of　the　coating　during　immersion　experiment.