The　biocompatibility　of　Ca2KNa(PO4)2　ceramics　was　investigated　by　means　of　cytotoxicity,　hemocompatibility　and　pyrogenicity　tests.　Hemocompatibility　tests　were　conducted　using　rabbit　blood　in　vitro　and　the　results　show　that　the　hemolysis　degree　of　Ca　2KNa(PO4)2　extracts　was　2.4%.　Cytotoxicity　tests　were　also　performed　with　MTT　assays　to　evaluate　the　influences　of　CA　2KNa(PO4)2　extracts　on　the　presentation　of　mitochondrial　dehydrogenase　enzymes　in　living　cells.　It　was　found　that　Ca　2KNa(PO4)2　ceramics　have　favorable　biocompatibility　for　repairing　bone　defects.