A　novel　audio　watermarking　scheme　for　copyright　protection　is　proposed　in　this　paper.　By　modifying　the　relationship　between　adjacent　coefficients,　watermark　message　is　embedded　in　the　wavelet　packet　domain.　The　embedding　procedure　is　controlled　by　Psychoacoustic　Model　to　guarantee　inaudibility.　The　new　method　combines　the　psychoacoustic　model　with　wavelet　packets　to　choose　the　best　basis　of　wavelet　packet　decomposition　such　that　the　decomposed　subbands　are　closer　to　Critical　Bands.　Therefore　the　masking　thresholds　in　the　new　approach　are　larger　than　the　previous　proposed　ones.　In　this　way,　the　proposed　scheme　enlarges　the　range　for　the　watermark　to　resist　attacks　and　become　more　robust.　Experimental　results　show　that　the　proposed　scheme　can　effectively　resist　a　variety　of　signal　manipulations　and　attacks,　including　MPEG　compression,　low-pass　filtering,　resampling,　white/random　noise　adding,　etc.