Hydroxyapatite　(HAP)　is　the　foremost　inorganic　components　of　human　hard　tissues　and　has　been　widely　applied　as　biomaterials　for　replacing　or　repairing.　In　this　study,　hydroxyapaptite　(HAP)　nanoparticles　with　controllable　morphology　were　facilely　synthesized　by　hydrothermal　treatment　of　abandoned　abalone　shells　without　adding　any　organic　template　agent.　The　morphology　of　HAP　nanoparticles　could　be　tailored　by　manipulating　the　hydrothermal　temperature　(from　60　degrees　C　to　150　degrees　C).　And　it　covers　leaf-like,　flower-like,　fish　scale-like,　snow-like　and　rod-like　shape.　Besides,　a　small　amount　of　calcium　carbonate　was　left　in　the　HAP　particles,　which　was　gradually　decreased　as　the　hydrothermal　temperature　increased　and　all　of　the　samples　have　negative　surface　potential.　This　study　provides　a　solution　for　synthesis　of　different　HAP　nanoparticle　morphology　from　abandoned　abalone　shell.　(C)　2018　Elsevier　B.V.　All　rights　reserved.