Backscattering coefficients play on important role in active microwave remote sensing applications in oceanography. In general

the backscattering coefficients can be calculated from scatter models. But the results are different from the choice of ocean wave spectra that there exist some different forms under some similar wind conditions. Additionally

the models are due to the Gussian distribution of sea surface elevation

which exists only within very low wind condition. Thus model predictions are not faithful reproductions of radar cross section very often. The paper presents a method to calculate the backscattering coefficients with the use of two dimensional spectrum function of sea surface elevation with the prediction of non Gaussian distribution of the elevation and slope of wave surface. Th method does not use a single wave spectrum. The results are comparable with SIR C/X SAR data of South China sea.