Abstract: In this paper，the variabilities of wind speed within and above maize canopy have been analyzed by using Morlet continuous wavelet transform ．The main results show that the continuous wavelet analysis provides a concise and compact information in the scale-time domain，it reveals the ld and 18d period components of the data．Averaged wavelet spectra over time and scales give the temporal variability and the energy distributions with different periodic components of the data．