Abstract: In order to solve the problem of high working pressure required for single spray gun irrigation on reel-type sprinkler irrigation machines, double spray guns for combined irrigation were proposed to use. Experiments were carried out on the mobile spraying water distribution of double and single spray guns under different working pressures to compare and analyze the irrigation uniformity of the two kinds of spray guns under different round irrigation combinations. The results show that when the working pressures of double and single spray guns are 0.10 and 0.25 MPa, the spraying widths are 45.08 and 45.60 m, respectively. When the two kinds of spray guns are combined with 1.5 times the spraying radius of the nozzle car, the combined uniformity is 81.72% and 80.36%, respectively, and the spraying effect is basically the same. Using the equivalent annual value method to compare the initial investment, energy consumption and annual operating costs of the two kinds of spray guns, it is found that under this working condition, the initial investment, energy consumption and annual opera-ting costs of double spray guns are 27.45, 77.58 and 105.04 yuan/hm~2 respectively, those of single spray gun are 12.95, 193.96 and 206.91 yuan/hm~2. Although the initial investment of double spray guns has increased slightly, its energy consumption and annual operating costs are reduced by 60.00% and 49.23% respectively compared with single spray gun. Therefore, spraying with double spray guns can reduce working pressure, energy consumption and annual operating costs while ensuring the quality of spraying.