Due　to　the　large　detection　range　and　high　sensitivity　to　damages,　Lamb　waves　are　widely　used　in　the　localization　and　quantification　of　structural　damages　in　a　plate　structure.　The　dispersion　curve　measurement　is　significant　in　the　applications　of　Lamb　waves,　especially　in　a　material　with　unknown　properties.　In　the　study,　a　method　was　proposed　to　measure　dispersion　curves　based　on　clustering.　Compared　with　traditional　methods,　the　proposed　method　could　realize　more　accurate　and　reliable　measurement　results　with　less　measured　data.　This　method　was　experimentally　verified　with　an　isotropic　aluminum　plate　and　an　anisotropic　CFRP　plate.　The　relative　error　between　measured　and　real　values　in　an　aluminum　plate　was　less　than　1%.　With　this　method,　A0　mode　phase-velocity　dispersion　curves　in　CFRP　plate　with　various　braiding　angles　were　experimentally　obtained.　This　method　facilitated　Lamb　wave　defect　detection　and　material　parameter　inversion.　©　2022　Elsevier　Ltd