Abstract: In order to understand the hydraulic performance of a sprinkler nozzle, the laws of governing water droplet diameter, velocity and kinetic energy were explored. A 2DVD video disdrometer was used to conduct hydraulic performance experiments with sprinkler nozzles of 2 equivalent diameters D_e under 5 working pressures. The results show that the average water droplet diameter of the nozzles with equivalent diameters of 4.88 mm and 5.98 mm are mainly distributed within the ranges of 0.73-1.38 mm and 0.85-1.53 mm, respectively. This indicates that the smaller the equivalent diameter of the nozzle, the more concentrated the droplet distribution of water droplets may be. Furthermore, the ave-rage water droplet diameter increases exponentially with increasing the distance from the nozzle, sho-wing an exponential distribution. Water droplet velocity also increases with increasing pressure and distance from the nozzle, and the average velocity of the nozzles with an equivalent diameter of 4.88 mm is greater than that of nozzles with an equivalent diameter of 5.98 mm. Under the same working pressure, the single droplet kinetic energy, unit volume energy and kinetic energy intensity of a nozzle with an equivalent diameter of 5.98 mm are all greater than those of the nozzles with an equivalent diameter of 4.88 mm. The single droplet kinetic energy is found to be related to the water droplet diameter exponentially, while the kinetic energy per unit volume is related to the distance from the nozzle exponentially. The kinetic energy intensity fluctuates within the range of 0.1-0.6 m from the nozzle with small amplitudes.