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Using a set of long-term disdrometric data measured by the Precipitation Occurrence Sensor System (POSS) at a mid-lat-itude environment (Montreal, Canada), the effects of drop deformation on precipitation measurements with polarimetric parameters are explored. The various polarimetric parameters are calculated from filtered drop size distributions (DSDs) parameters is then performed to investigate the impact of different drop deformations on precipitation estimates. As indicated by the variation of the value of b (4.4~5.3) in the best fit of bDP aD K = , DPK is highly dependent on the drop deformation, leading to significant random errors in the estimation of R when DPK parameters. This is due to the effectiveness of DPK in explaining the variability of DSDs. Similarly, the shorter wavelengths are les subject to the DSD variability. However, the random error in the estimation of R with any combination of hZ and DR Z is nearly insensitive to the drop deformation. The systematic variation of DPK and DR Z that depends on different drop of a correct knowledge on drop shape in precipitation estimation with polarimetric radar.