A　scattering　parameter　circumferential　distribution　chart　was　employed　to　present　the　2D　scattering　characteristics　of　defects.　The　FE　model　of　a　Lamb　wave　interaction　with　defects　was　investigated.　A　dual-element　exciting　method　was　used　to　produce　a　pure　S0　mode　as　incident　wave.　An　absorbing　boundary　was　used　to　eliminate　the　wave　reflection　of　a　border.　Scattering　signals　in　all　the　directions　were　acquired　and　post-processed　so　that　a　scattering　parameter　circumferential　distribution　chart　could　be　plotted.　This　FE　model　was　validated　experimentally　and　a　good　agreement　was　obtained　between　FE　and　experimental　results.　The　interaction　of　an　S0　mode　with　a　trough-thickness　hole　and　a　crack　was　studied　and　scattering　parameter　distribution　charts　with　0　degree　incident　were　measured.　The　charts　could　be　used　to　characterizing　the　kinds　of　defects.　The　energy　distribution　of　multi　scattering　modes　also　was　studied.　The　results　show　that　the　single　mode　exciting　and　multi-modes　receiving　could　avoid　undetected　defects.