In　order　to　improve　the　efficiency　of　plate　structure　defect　detection,　an　ultrasonic　local　resonance　detection　method　based　on　wideband　excitation　is　developed　in　this　paper.　The　maximum　between-class　variance　method　is　used　to　analyze　and　process　the　ultrasonic　field　under　broadband　excitation,　and　the　ultrasonic　local　resonance　frequency　of　the　defect　is　obtained.　The　acoustic　field　spatial　distribution　under　ultrasonic　local　resonance　frequency　is　used　in　the　detection　and　imaging　of　the　plate　structure　damage.　Aiming　at　the　isotropic　plate　structure　with　specific　material　and　thickness,　the　relationship　model　of　defect　size　and　ultrasonic　local　resonance　frequency　is　established　by　means　of　the　uniform　design　test.　The　experiment　results　show　that　the　developed　ultrasonic　local　resonance　detection　method　can　effectively　achieve　the　damage　detection　of　isotropic　and　anisotropic　plate　structure.　With　the　regression　analysis　model,　the　inversion　of　the　geometric　parameters　of　the　defects　can　be　achieved,　and　the　inversion　precision　is　high　(the　maximum　radius　inversion　error　is　2　mm,　and　the　maximum　thickness　inversion　error　is　0.6　mm).　This　study　provides　a　feasible　technical　scheme　for　the　defect　detection　and　quantitative　analysis　of　plate　structure.　©　2019,　Science　Press.　All　right　reserved.