Twenty sphere-cone-oblate ice particles are simulated for their backscattering observations in a microwave lab and calculations are done with the DDA method.The lab experiment and the DDA theory are brie7ypresented in this paper.The theoretical results are compared with the lab observations.It is shown that the theoretical results are consistent with the experimental data in general and that the backscattering ability of sphere-cone-oblate ice particles increases as the particle size parameter increases,and 7uctuates in the so-called resonance region.The backscattering cross sections of sphere-cone-oblate ice particles depend not only on their sizes equivolume spherical radii Re but also on their shapes.There is a statistically linear relationship between di:erential re7ectivity ZDR and the shape factor, 2a/h,which is the ratio of the horizontal scale to the vertical scale of a particle.