When the shapes of particles in precipitation can be distinguished by dual linear polarization radar using the detection of differential reflectivity factor ZDR， the effects of changes of elevation angle on the ZDR are take into account. According to the equation of weather radar for small rotating spheroidal raindrops, the Gamma raindrop size distribution is used to simulate the effects on ZDR with the orientation of rotatory axes of particles presented vertical uniformly in the air when the elevation angles and the parameters of distribution are changed. The maximum of elevation angle which can make ZDR change within 10% should be not exceeded above 16.7°. It would be helpful to improve the accuracy of measurement of ZDR and the detecting precipitation by polarization Radar.
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