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Wind field is one of the important factors affecting the distribution characteristics of aerial spraying droplet deposition.In order to reveal the impact mechanism of droplet deposition distribution by the wind field below agricultural unmanned helicopter rotor,this article measured the wind field distribution below uniaxial singlerotor electric unmanned helicopter rotor by using a wireless wind speed sensor network measurement system for unmanned helicopter,and analyzed effect of wind field in X,Y,Z three directions below the rotor on droplet deposition distribution with the condition of aerial spraying droplet deposition in rice canopy,and established the regression model by making the variance analysis and regression analysis of experiment results.The results showed that: In the 3-dimensional wind field below uniaxial single-rotor electric unmanned helicopter rotor,the wind field in Y direction had a significant effect on droplet deposition in effective spray area,the wind field in Z direction had an extremely significant effect on droplet deposition in effective spray area,the corresponding Sig.values were 0.011 and 0.000.Further more,the wind field in Z direction had a significant effect on the penetrability and uniformity of droplet deposition in effective spray area,the corresponding Sig.values were 0.025 and 0.011 respectively.The wind speed in Y direction at the edge of effective spray area had a significant effect on droplet drift,the Sig.value was 0.021.In addition,R of the regression model which between droplet deposition in effective spray area and the wind speed in Y and Z directions as well as it between the uniformity of droplet deposition in effective spray area and the maximum wind speed in Z direction,were 0.869 and 0.915 respectively,this result can provide a guidance for the actual production application.The result have revealed the effect mechanism of the distribution of aerial spraying droplet deposition on the wind field below the uniaxial single-rotor electric unmanned helicopter rotor,and discussed effect of the wind field below the rotor on droplet deposition in plants from the view of crop lodging.It has an important guiding significance for reducing liquid drift of aerial spraying and improving the utilization rate of pesticide in the actual spraying application.