The　effect　of　anchored　length　of　a　mining　anchorage　cable　on　amplitude　attenuation　and　group　velocity　of　ultrasonic　longitudinal　guided　wave　mode　L(0,　1)　was　investigated　experimentally.　Firstly,　the　propagation　characteristics　of　ultrasonic　longitudinal　guided　wave　in　a　mining　anchorage　cable　unanchored　were　analyzed　with　the　dispersion　curves　of　a　steel　wire　simplified　as　a　rod.　Then,　a　piezoelectric　element　of　thickness　vibration　type　was　used　to　perform　a　through-transmission　test　in　a　mining　anchorage　cable　anchored　with　cement,　and　the　amplitudes　of　L(0,　1)　mode　were　acquired　in　the　frequency　range　of　20-500kHz.　The　piezoelectric　element＇s　most　suitable　monitoring　frequency　for　guided　wave　in　the　mining　anchorage　cable　anchored　with　cement　was　280kHz.　Based　on　this　result,　the　amplitude　attenuation　and　group　velocity　variation　characteristics　of　L(0,　1)　mode　at　several　frequencies　near　280kHz　were　studied　in　the　mining　anchorage　cable　with　increase　in　anchored　length.　Finally,　the　through-transmission　tests　were　performed　in　a　mining　anchorage　cable　anchored　with　resin,　the　test　results　coincided　with　those　obtained　in　the　mining　anchorage　cable　anchored　with　cement.　These　tests　provided　a　basis　for　the　length　measurement　of　anchored　mining　anchorage　cables　by　using　ultrasonic　longitudinal　guided　waves.