全文介绍了小波变换的基本理论，并介绍了一些常用的小波函数，它们的主要性质包括紧支集长度、滤波器长度、对称性、消失矩等，都做了简要的说明。在不同的应用场合，各个小波函数各有利弊。-Text describes the basic theory of wavelet transform, and describes some of the commonly used wavelet function, their main properties include compactly supported length, filter length, symmetry, vanishing moments, have a brief descr iption. In different applications, advantages and disadvantages of each wavelet function.