Propagation　characteristics　of　longitudinal　modes　of　bolt　embedded　in　soils　were　studied.　The　attenuation　of　longitudinal　mode　L(0,1)　at　a　range　of　frequency　from　40　kHz　to　90　kHz　was　the　smallest　in　all　modes.　Its　energy　velocity　was　the　fastest.　And　its　profile　of　displacement　was　simple,　which　made　it　to　be　excited　easily.　It　was　indicated　that　longitudinal　mode　L(0,1)　could　be　used　in　the　inspection　of　bolt　embedded　in　soil　because　it　could　propagate　longer　distance　in　the　bolt　and　be　distinguished　from　other　modes　with　slow　energy　velocity.　At　the　same　time,　the　experiments　with　bolts　22　mm　in　diameter,　2　m　in　length　embedded　in　soils　detected　using　ultrasonic　guided　waves　were　carried　out.　It　was　shown　that　longitudinal　mode　L(0,1)　between　40　kHz　and　90　kHz　was　suitable　for　the　inspection　of　length　and　construction　quality　of　bolt　embedded　in　soils.