The spectrum and statistical analysis are made of measured wave data with double-peaked spectra in the Xiangshui sea area. By investigating the wave heights probability distributions,the period probability distributions and the joint probability distributions of wave heights and periods of sea waves with double-peaked spectra,we know that sea waves with single-peaked spectra turn out to be not suitable for describing sea waves with double-peaked spectra. On the basis of measured wave data with double-peaked spectra in the Xiangshui sea area,we propose empirical probability distributions of wave heights and periods of sea waves with double-peaked spectra. Some spectral parameters related to the spectral width are calculated through spectrum analysis and compared with those of Goda’s field observation. Furthermore,the spectral characteristic values of sea waves with double-peaked spectra are compared with the statistical ones,and we find that there is only little difference between the significant wave height calculated by the spectrum method and the one calculated by the zero-crossing method;and the mean period calculated by spectrum period is a little bit smaller than that calculated by the zero-crossing method.