Monetite　(CaHPO4)　was　coated　on　the　Ti-6Al-4　V　substrate　by　hydrothermal　method.　SEM,　XRD,　EDS,　XPS,　Raman　spectroscope,　and　tensile　test　were　used　to　characterize　the　morphology,　phase　constitutes,　elemental　content,　elemental　valence　states,　chemical　functional　groups,　and　bonding　strength　of　the　coating,　respectively.　It　was　revealed　that　the　elevated　temperature　and　prolonged　duration　time　are　favourable　to　the　purity,　densification　and　crystallinity　of　the　monetite　coating.　The　maximum　bonding　strength　of　17.03　+/-　2.79　MPa　is　found　at　the　hydrothermal　treatment　temperature　of　190　celcius　and　duration　time　of　8　h.　Both　simulated　mineralization　experiment　and　the　degradation　experiment　show　that　the　monetite　coating　have　good　bioactivity　and　chemical　stability,　and　is　promising　to　be　applied　in　the　field　of　orthopaedic　implant　materials.