Through the introduction of wavelet image denoising method and wavelet threshold denoising steps,this paper discusses the role of wavelet bases in wavelet threshold denoising, and describes the characteristics of several common wavelet bases and their correlation properties. Finally, respectively with a db2 and sym4 two kinds of wavelet bases by MATLAB, to denoise wavelet threshold realizes the image filtering and reconstruction of high frequency coefficients, so the conclusion is obtained that using different wavelet bases affects the results of image denoising.%通过介绍小波图像去噪的方法和小波阈值去噪的步骤，讨论小波基在小波阈值去噪中的作用，阐述了常见的几种小波基的特征及其相关性质的比较。最后通过在MATLAB下，分别选择了db2和sym4两种小波基，进行小波阈值去噪实现图像高频系数的滤波并重建，得到采用不同的小波基影响图像去噪效果的结论。
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