Observation was made with the ground raindrop size meter synchronously with a hygroscopic paper for the spots to investigate the reliability of the meter measurements.Results show that 1)both types of data yield the significance level of 0.005 for the characteristic quantity linear correlation except the mean diameter,mean square rcot diameter similarity and 2)double-factor variance analysi indicates that no significant difference exists in the characteristic quantities but mean diameter and mean square rcot diameter of the size distribution and rainfall intensity.