By using the data observed by a laser raindrop spectrometer from August 2009 to October 2010,the microphysical characteristics and raindrop size distributions varying with time in three kinds of precipitation in Shandong were analyzed.According to different precipitation clouds,the values of microphysical characteristics were compared.The results show that the values in convective cloud precipitation,mixed-cloud precipitation and stratiform cloud present a decreasing trend.The precipitation intensity is consistent with the density of raindrops and the maximum diameter in all three kinds of precipitation.The raindrops of diameter at less than 2 mm play the most important role in precipitation brought by stratiform cloud and mixed-cloud,while those of diameters between 1 mm and 3 mm contribute the most to the rain intensity in cumulus precipitation.The distribution of raindrop size in stratiform precipitation is very narrow,which is mainly of single-peak or double-peak;for cumulus precipitation,it has a wide spectrum with a multi-peak structure in great drops;the spectral width in mixed-cloud precipitation is between the aformentioned two.In addition,the Z-I relation formulas in the three different precipitation clouds is analyzed,which can be used in the quantitative measurement of rainfall.