在模拟地震记录信号中加入信噪比为17的高斯白噪声，然后分别采用小波降噪和小波包降噪方法,对含噪信号进行降噪处理。在不同降噪阈值下，比较降噪后信号的信噪比。结果表明：在同一降噪阈值下，小波包降噪后信号的信噪比高于小波降噪后信号的信噪比，而且采用wbmpen方法给定的阈值明显可以提高降噪后信号的信噪比。

We add white gaussian noise to analog seismic signal with signaltonoise ratio of 17. Then, we reduce noise of the signal using the method based on wavelet transform and wavelet packet transform. And, we compare the value of signaltonoise ratio after noise reduction by one method with that by the other under different threshold. Then, we obtain the result. The value of signaltonoise ratio after noise reduction based on wavelet packet transform is higher than that based on wavelet transform. Furthermore, it is obviously raised that the value of signaltonoise ration after noise reduction using the method of wbmpen.