Abstract: The control efficiency of pest in orchard are closely related with spray characteristics of orchard sprayer. This paper experimented and analyzed the effects of spraying pressure, test position, fan speed on droplet size and the effects of canopy position, running speed on droplet coverage and penetrability according to the GY8 orchard sprayer. Results showed that droplet size was decreased with the increase of spraying pressure. During the air conveying, the bigger were droplets easy to fall off, the smaller were droplets easy to drift. However the spray flow was steady in the range of 2-3 m, and the droplet size D₅₀ was close to 200 μm, and fan speed had no significant effect on droplet size. The droplet coverage of leaves ’ back was far smaller than that of the front in each canopy position. The droplet coverage decreased with the increase of canopy height in larger fruit trees, and each layer was clearly not uniform. However the coverage was well-distributed and high when the trees were lower than 3 m. The coverage of different canopy’s vertical planes decreased with the increase of spray depth. The droplet coverage decreased with the increase of running speed, when the speed increased by 200%, and the coverage of different canopy’s heights and different canopy’s vertical planes were decreased by 31.8% and 44.3% respectively. The fruit trees could get higher coverage when the running speed was 0.5 m/s.