To　study　the　mechanism　of　energy　reflection　and　transmission　of　ultrasonic　in　the　adhesive　structure,　under　the　assumption　of　perfect　connection,　the　ultrasonic　wave　interaction　with　the　interfaces　of　plate-like　adhesive　structure　was　studied　when　the　longitudinal　waves　were　incident　with　different　angles.　The　effects　of　the　incident　angles,　frequency-thickness　product　on　the　reflection　and　transmission　characteristics　of　ultrasonic　energy　were　analyzed.　The　numerical　results　show　that　when　the　longitudinal　waves　are　vertically　incident,　the　conversions　of　wave　mode　do　not　occur,　with　the　increment　of　frequency-thickness　product,　the　reflection　and　transmission　coefficient　curves　of　energy　of　longitudinal　waves　obviously　produce　periodical　resonance.　When　the　longitudinal　waves　are　obliquely　incident,　the　conversions　of　wave　mode　will　happen,　as　the　product　of　frequency-thickness　increases,　the　reflection　and　transmission　coefficients　of　energy　of　longitudinal　and　transverse　waves　do　not　have　periodical　resonance.　For　the　case　of　the　incident　angles　less　than　90°,　the　displacement　potential　reflection　coefficients　of　longitudinal　waves　are　always　bigger　than　the　energy　reflection　coefficients;　however,　the　reflection　coefficient　curves　of　displacement　potential　and　energy　for　transverse　waves　occur　cross　with　increasing　angles.　The　results　provide　a　theoretical　basis　for　the　experimental　detection　of　adhesive　structure　by　ultrasound.　©　2016,　Beijing　University　of　Technology.　All　right　reserved.