Coupled with physical geographical features in arid areas

multi-temporal backscattering coefficients data（wet and dry seasons） were generated by IEM model.Analyzing these simulated data

we found there is a strong correlation between difference of wet and dry seasons backscattering coefficients(σ

0

wet

-σ

0

dry

) and soil dielectric constant

which is in agreement with the experimental observation in the literature;and then established the relation model between σ

0

wet

-σ

0

dry

and dielectric constant.This paper also carried out the research about salinization that is common in arid areas

and found there is a good correlation between σ

0

wet

-σ

0

dry

and the large difference of imaginary part of dielectric constant.This result is helpful to retrieve soil salt content if there is a clear understanding about the relation of imaginary part and soil moisture and salt content.