The research on crops microwave scattering model is developing fast. But

the integrated study of both volume and surface model is still in the beginning stage in China. This paper applies the combined model to the cotton soil media and conducts some exploring works. Microwave scattering in cotton soil media has been calculated from zero

first to second order scattering. The paper analyses major factors which affect the backscattering coefficient. Some valuable conclusions have been drawn. Among these

the incident wave frequency and cotton leaf radius are the major factors. For cotton field scattering in small incident angles （<30°）

the major scattering is from soil surface

when the incident angle is more than 30°

the major scattering is from cotton canopy. It may be helpful for cotton microwave remote sensing monitoring and discrimination.