In　this　paper　a　novel　watermarking　scheme　for　audio　authentication　is　proposed.　During　quantization　process,　the　watermark　is　embedded　in　the　wavelet　packet　domain.　The　best　basis　of　the　wavelet　packets　adapts　to　the　Psychoacoustic　model　so　that　the　decomposed　subband　structure　is　closer　to　that　of　Critical　Bands,　which　makes　the　embedding　algorithm　more　flexible.　Unlike　previous　schemes,　the　new　method　embeds　several　bits　of　watermark　message　into　one　coefficient.　By　introducing　the　detecting　function,　the　proposed　scheme　can　authenticate　the　integrity　of　the　audio　signals　as　well　as　locate　the　tamper　in　time/frequency　domain.　Effectiveness　of　the　new　approach　is　demonstrated　by　the　experimental　results.