a fast algorithm to reconstruct the signal from its wavelet transform modulus maxima is built
in which the wavelet transforms of a step function are used as bases to reconstruct the wavelet transform of the sigul according to the medulus maxima on every scale
and then all of these components are used to reconstruct the signal by inverse wavelet transform. This methed is of explicit physical meaning and can be implemented conveniently. The methed of error medification is also given in this paper. Numerical results show that the fast reconstruction algorithm is effective for different types of signals.