To improve the irrigation uniformity of the variable-rate sprinkler, the relationship between the non-circle nozzle and the rainfall distribution of the variablerate sprinkler was studied. Based on equal nozzle area, non-circle nozzles with different shapes were designed and their hydraulic characteristics were compared through experiment. The experiment indicated that for the star shaped nozzle, the range rarely decreased and the tendency of the rainfall distribution under different pressures were similar. The hydraulic character was compared between the star shaped nozzle and the circle nozzle. For the star shaped nozzle, the rainfall distribution of the long range area was 85% of the short range area, for the circle nozzle, the number was 79%, which indicated that the rainfall distribution of the star shaped nozzle was better than that of the circle nozzle. The isogram of sprinkler water depth showed that the irrigation uniformity of the star shaped nozzle was better than that of the circle nozzle and the irrigation uniformity of the square irrigation area was better than that of the triangle irrigation area.