The representation of 1/f signal with wavelet transformation is explored. It is shown that a class of 1/f signal can be represented via wavelet synthetic formula and that a statistically self-similar property of signals may be characterized by the correlation functions of wavelet coefficients in the wavelet domain. The representation of 1 / f signal with wavelet transformation is explored. It is shown that a class of 1 / f signal can be via via wavelet synthetic formula and that a measured self-similar property of signals may be characterized by the correlation functions of wavelet coefficients in the wavelet domain.