Terahertz　time-domain　spectrum　of　PbWO4(PWO)　crystal　in　the　frequency　range　from　0.1　THz　to　3　THz　was　measured　at　the　room　temperature.　The　results　show　that　the　absorption　coefficient　is　less　than　30　cm-1　as　the　frequency　changed　from　0.2　THz　to　0.9　THz,　indicating　that　the　PWO　crystal　has　a　high　transmission　characteristic.　A　little　overtone　resonance　is　observed　in　the　frequency　range　from　0.4　THz　to　0.6　THz.　The　values　of　the　refractive　index　are　2　to　6,　and　the　refractive　index　exhibits　anomalous　dispersion　in　the　frequency　range　from　0.36　THz　to　0.9　THz.　According　to　the　relation　of　optical　constants,　dielectric　function　curve　was　obtained.　The　real　part　values　of　dielectric　function　is　4　to　38,　and　there　is　an　obvious　resonance　peak　in　the　real　part　of　dielectric　function　curve　in　0.36　THz.　The　imaginary　part　of　dielectric　function　declines　from　0.7　to　0.3　with　frequency　increasing.　©,　2015,　Chinese　Ceramic　Society.　All　right　reserved.