K0.5Bi0.5TIO3(KBT)nanocrystalline　particles　were　hydrothermally　synthesized　from　Bi(NO3)(3)(.)5H(2)O,　TiO2　and　KOH.　The　crystal　phase,　chemical　composition　and　microstructure　were　characterized　by　XRD,　XRF,　Raman　scattering　spectroscopy　and　TEM.　The　results　indicated　that　the　products　were　pure　perovskite　structured　K0.5Bi0.5TiO3　with　chemical　stoichiometry　and　perovskite　structure.　The　TEM　observation　revealed　that　the　particles　possessed　a　feature　of　cubic　shape　and　a　nano-scale　of　about　40　nm.　The　KBT　ceramics　sintered　at　1040　degrees　C　from　hydrothermal　powders　show　higher　density　and　better　electric　properties　than　that　prepared　by　a　solid-state　reaction　method.