Microplasma　arc　spraying　was　utilized　to　deposit　hydroxyapatite　(HA)　powders　on　Ti6Al4V　substrate.　Scanning　electron　microscopye　and　X-ray　diffraction　were　used　to　investigate　the　morphology,　phase,　and　crystallinity　of　the　HA　coatings.　Sufficient　melting　of　HA　particles　and　spreading　after　collision　were　observed　with　the　increase　of　arc　current　and　gas　flow　rate.　Within　the　spraying　distance　range　from　70　mm　to　130　mm,　the　degree　of　melting　of　the　HA　particles　increased　with　the　spraying　distance.　Under　appropriate　spraying　parameters,　the　crystallinity　of　microplasma　arc　sprayed　HA　coatings　was　comparable　or　even　higher　than　the　one　from　conventional　atmospheric　plasma　arc　spraying,　which　is　beneficial　to　the　improvement　of　their　stabilities　in　such　liquid　environment　as　body　fluids.