The 21-point average method,wavelet transform method and wavelet-packet transform method were applied to carry out de-noise of DTG curves for a kind of corn stalks sample,thus to obtain a more ideal DTG curve.Through comparing several parameters,like the peak characteristics,signal-noise-ratio(SNR),signal-noise-ratio gain(GSNR),time shifting,power spectrum,variation coefficient,the Lipschitz exponent,flatness index and others,the results show that,the wavelet-packet transform method prefers to keep the peak...