Abstract: According to that there are few researches for the external spraying characteristics of damping sprinkler, the paper studied kinetic energy per unit volume and kinetic energy intensity of the sprinkler with or without water sprinkling gear under different nozzle diameters. In order to study the kinetic energy distribution and its model of damping sprinkler, hydraulic parameters of damping sprinkler were tested under the operating pressure of 175, 200, 250 and 300 kPa with different nozzle diameter of 3.6, 4.0, 4.4 and 4.8 mm, respectively. The laser precipitation monitor (LPM) was used to measure the drop diameter and velocity. The result showed that kinetic energy per unit volume of the sprinkler without or with water sprinkling gear was small at the test location between 0 and 3 m along the sprinkler. Meanwhile the difference of kinetic energy per unit volume of the sprinkler without or with water sprinkling gear was small as well. Kinetic energy per unit volume of the sprinkler with water sprinkling gear was larger than the one without water sprinkling gear when the distance from the nozzle increased. And the variation range of kinetic energy per unit volume increased with the increasing of the distance from the sprinkler. Without water sprinkling gear, the difference of kinetic energy per unit volume was small for different nozzle diameters at the same distance from the sprinkler, but it was bigger under the condition with water sprinkling gear. At the same location from the sprinkler, kinetic energy per unit volume decreased with the increase of nozzle diameter. The models of kinetic energy per unit volume and kinetic energy intensity distribution were established. The correlation coefficient of kinetic energy per unit volume distribution model was above 0.94. The correlation coefficient of kinetic energy intensity distribution model was above 0.90. Kinetic energy intensity of the sprinkler with water sprinkling gear increased when the distance from the sprinkler increased. Without water sprinkling gear, kinetic energy intensity increased firstly, then gradually decreased, next increased again, and finally decreased rapidly to 0. Water sprinkling gear could make kinetic energy intensity reach the maximum in advance. Kinetic energy intensity was small at the test location between 0 and 2 m along the sprinkler with or without water sprinkling gear. The difference of kinetic energy intensity became larger when the distance was over 2 m. Compared to the sprinkler with water sprinkling gear, kinetic energy intensity of the sprinkler without water sprinkling gear under different working pressure was relatively small. With the distance from the sprinkler increasing, kinetic energy intensity showed a trend of increasing gradually firstly and then dropping to 0. The kinetic energy intensity under different nozzle diameters was small when the distance from the nozzle was 0-4 m and the difference was less than 0.002 W/m2. When the distance from the nozzle was further, the kinetic energy intensity of the sprinkler for different nozzle diameters was different greatly, and the maximum difference reached 0.006 W/m2. There was no obvious relationship between kinetic energy intensity and nozzle diameter with water sprinkling gear when the location from the sprinkler is same. The result provides certain academic value for studying the damping sprinkler's external spraying characteristics.