Propagation　characteristics　of　high　frequency　longitudinal　axisymmetric　modes　in　full-length-bonding　bolt　are　studied.　For　the　same　mode　in　bolt,　its　attenuation　and　velocity　vary　greatly　with　frequency　range.　In　theory,　there　is　high　order　longitudinal　mode　above　1　MHz　whose　axial　displacement　concentrates　in　the　middle　of　bolt.　Its　attenuation　is　the　smallest,　and　its　energy　velocity　is　the　fastest　in　all　modes　at　the　special　high　frequency.　This　indicates　that　the　high　order　low　loss　longitudinal　mode　can　be　used　to　inspect　full-length-bonding　bolt.　At　the　same　time,　the　experiments　about　diameter　22　mm,　1　m　length　bolt　without　defect　embedded　in　grout　detected　using　ultrasonic　guided　wave　are　carried　out.　The　scope　of　inspection　frequency　is　between　1.13　MHz　and　2.85　MHz.　The　velocity　and　amplitude　curves　of　first　end　reflection　with　frequency　are　made.　The　experiment　curves　are　consistent　with　those　dispersion　curves　of　theory.　Besides,　the　experiment　that　the　bolt　with　one　defect　embedded　in　grout　detected　by　guided　waves　also　is　carried　out.　This　indicates　that　ultrasonic　guided　waves　can　be　used　to　inspect　the　length　of　bolt　and　confirm　the　location　of　defect.　Finally,　site　inspection　for　diameter　18　mm,　2　m　length　bolt　is　performed.　The　inspection　results　show　that　the　guided　waves　technology　is　available　for　the　nondestructive　testing　of　full-length-bonding　bolts.