HA　coatings　was　deposited　on　TiAI6V4　substrate　using　a　finer　hydroxyapatite　spray　powder-53　μm　and　a　new　plasma　spray　process　＇microplasma　spraying＇　in　this　study,　and　the　influence　of　spray　parameters　on　the　coating　microstructure　and　crystallinity　was　investigated.　It　was　found　that　three　different　coating　structures　could　be　obtained　by　changing　spray　parameters.　The　first　structure　can　be　characterized　by　many　unmolten　HA　particles　embedded　in　the　coatings.　The　second　one　can　be　characterized　by　a　typical　lamellar　coating　structure　and　a　high　texture　content.　The　third　one　can　be　characterized　by　high　content　amorphous　phase,　leading　to　less　grain　boundaries　in　the　coatings.　The　coatings　both　with　the　first　coating　structure　and　the　second　one　have　high　coating　crystallinities.　The　functionally　graded　coating　combined　with　the　second　and　the　third　structure　satisfied　the　need　of　rapid　apatite　layer　forming　speed　in　early　stage　and　long　term　stabilization　after　being　embedded.