The　propagation　properties　of　stress　waves　in　rock　masses　are　significantly　affected　by　high　temperature.　This　paper　presents　an　experimental　investigation　on　the　frequency-spectrum　characteristics　of　stress　waves　in　hightemperature　granites.　The　pendulum　impact　test　was　performed　on　high-temperature　granite　bars　to　generate　stress　waves.　The　frequency-spectrum　variation　of　stress　waves　in　high-temperature　granites　was　investigated　by　adopting　the　discrete　Fourier　transform.　The　effects　of　temperature　on　both　the　spectral　attenuation　ratio　and　the　average　energy　dissipation　rate　of　the　harmonic　wave　were　discussed.　The　results　show　that　frequency　spectra　of　stress　waves　occur　attenuation　when　stress　waves　propagate　in　high-temperature　granites.　The　frequencyspectrum　attenuation　is　more　obvious　in　the　granite　with　higher　temperature.　Moreover,　the　spectral　attenuation　ratio　and　the　average　energy　dissipation　rate　of　the　harmonic　wave　are　significantly　affected　by　the　high　temperature.　The　spectral　attenuation　ratio　and　the　average　energy　dissipation　rate　of　the　harmonic　wave　increase　as　temperature　increases.