Abstract: There are two main problems in the application of laser-optical disdrometer at present, i.e., a large precipitation accumulation deviation for heavy rains and no calibration device applied to the equipment for meteorological observatory.The new LPA10 laser-optical disdrometer, which uses unique technologies, gets a better precision of precipitation particle size measurement and achieves a small deviation during heavy rain situations. Furthermore, the LPA10 disdrometer is equipped with a calibration device for the meteorological observatory to ensure the measurement accuracy and data validity of the device. Through comparative observation and analysis of a variety of equipment in laboratory and outdoor, the results show that in the observation of normal rain, both the LPA10 and the international popular laser-optical disdrometer got a small deviation of accumulated rainfall, which is about 5%. However, in the observation of heavy rain, the deviation of accumulated rainfall between the LPA10 laser-optical disdrometer and the traditional rain gauge is quite small, and most of the absolute deviations are within 5%, which gets a better application effect.