Abstract: A comparison observation between the Parsivel raindrop spectrometer and the new generation weather radar on a rainstorm occurring in Shenyang area in 2012 was conducted and the counted classifiable reflectivity factor Z_P calculated with the raindrop spectrometer data was compared with the reflectivity factor Z calculated with the radar Range-Height Indicator data.The results show that for the rainstorm,the echo intensity of radar is underestimated and the reflectivity factor Z_P is greater than Z.Based on the statistics of radar data at a single point and its 3-point average,the reflectivity factor Z is on average about 8.30 dBz and 8.64 dBz lower than the normal value respectively.The sampling range of observation instrument,temporal-spatial matching of data and the change of spectral width are the main reasons for causing the inconsistency between two kinds of reflectivity factors observed with the two devices.