The　time　reversal　method　has　been　widely　used　to　detect　damage　in　composite　plates.　Based　on　the　time　reversibility　of　Lamb　waves,　the　waveform　of　the　original　input　signal　will　be　reconstructed　after　the　time　reversal　process.　However,　the　time　reversal　operator　of　Lamb　waves　in　composite　plates　is　a　function　of　frequency.　Thus　the　shape　of　the　reconstructed　signal　will　not　be　identical　to　that　of　the　original　input　signal.　To　alleviate　the　effects　of　the　time　reversal　operator,　an　improved　time　reversal　method　(ITRM)　is　proposed.　In　this　method,　the　response　signal　in　the　forward　path　and　the　reconstructed　signal　in　the　time　reversed　path　are　both　modulated　by　a　weight　vector　which　is　obtained　as　the　product　of　a　window　function　and　the　reciprocal　of　amplitude　dispersion.　The　window　function　varies　with　the　excitation　signal　adaptively,　and　its　shape　is　also　determined　by　a　threshold.　An　experimental　example　is　then　introduced　to　illustrate　the　effectiveness　of　the　ITRM.　The　results　show　that　the　time　reversibility　can　be　greatly　enhanced　and　the　impact　damage　in　the　composite　plate　can　be　exactly　located　by　the　ITRM.