Abstract: The application of spaceborne rain radar should satisfy some main requirements: high spatial resolution, wide coverage, large dynamic range for rainrate measurements and accurate point rainfall rate measurements. Due to the technical constraints, the radars satisfying the above requirements work at the attenuated frequency. The stereoradar analysisis conceived as a procedure to correct the reflectivity field for attenuation by using the apparent reflectivities observed along the radars's two viewing angles and to retrieve the specific at tenuation coefficient field. This paper is to study by simulation the influence of non uniform beam filling effect due to the implementation of the spaceborne means on the stereoradar analysis.