A cell model, a cellularstroma model and a “cellularstroma & nuclear” model are presented, which demonstrate three types of biological cells, respectively. By using a FDTD method, models′ RCS in the far-field are compared, and influences of cell′s sub-microstructures, including organelles, nucleolus and cellularstroma on its scattering properties are researched. The results show that cells′ scattering properties are mainly determined by cellularstroma. Light scattering from cells and propagating in two directions of 20°≤θ≤40° and 150°≤θ≤180° are increased by nucleus but decreased by organelles, which distribute randomly, that making scattering light intensity in all direction more uniform.