According to the fact that water distribution of variable rate complete fluidic sprinkler is not uniformity under different pressures, 20PXH variable rates complete sprinkler was taken as the research model, and eight different schemes of vice nozzles were designed and analyzed by jet water theory. The water distribution was measured. The method of analyzing the test data by different sprinkler irrigation intensities under different pressures was applied, and the best scheme was obtained. The test for water distribution under different pressures and baffle angles was carried out. Taking maximal uniformity coefficient as the function objective, and the range of baffle angle and uniformity coefficient as the constraint conditions, the comprehensive evaluation function of variable rates of the complete sprinkler uniformity was created for the first time. The optimum baffle angle is 21.2° by derivative the function.