To study the observing performance differences of two laser raindrop spectrometers, Parsivel and LNM, an analysis is made of the observational data from two laser raindrop spectrometers at the Beijing southern observatory from July to November 2014 (123 days under the North rainy conditions), considering manual records in the same period as standards. Comparison is conducted in the cumulative rainfall, precipitation beginning and ending time, and the particle information between the two devices. The results show that the Parsivel laser raindrop spectrometer lacks of sensitivity in timely reporting of precipitation beginning time, has more abundant classification information, and outputs larger particle diameters compared with LNM in the same precipitation process. In terms of cumulative rainfall, the results of the two devices and tippingbucket raingauges basically are comparable. When the cumulative rainfall is over 10 mm, LNM reports significantly greater cumulative rainfall than Parsivel.