Abstract: The error of raindrop size distribution estimation using PARSIVEL disdrometer is carefully studied, and an error correction method is proposed. Raindrop distribution data of two kind of precipitation by PARSIVEL disdrometer at Yangjiang in 2014 are analyzed. Results show that, the measured raindrop size distribution data are in good consistency with the empirical curve from Atlas, but the velocity measurement error is large when the particle size is below 1 mm or above 3 mm. The error analysis indicates that velocity measurement error of big particle is caused by deformation, while the error of small particle is caused by the instrument itself, and the vertical air motion near the disdrometer is influential for both situations.According to the detective principle of PARSIVEL disdrometor and the relationship between the deformation particle, a corrected Atlas-Ulbrich curve is given. The detective data of stratiform cloud precipitation are stable. An correction error curve of small particles is given by calculating the vertical air velocity of no less than 1 mm in diameter data from the stable precipitation, excluding the air motion in the diameter less than 1 mm. Small particle data are corrected, and the corrected raindrop distribution data are in good consistency with corrected Atlas-Ulbrich curve. The droplet concentration increases significantly and large drops concentration reduce slightly after correction. The intercept, slope and shape parameters of Gamma distribution of two kinds of precipitations are calculated before and after the correction, and the comparison shows that the corrected intercept parameter and slope parameter increase obviously, while the shape parameter barely changes.