[Objectives]  To clarify the effects of different flight parameters and nozzle types of an unmanned aerial vehicle (UAV) on chlorantraniliprole droplet deposition, and the resultant the efficacy of Spodoptera frugiperda control. [Methods]  A UAV was used to spray 200 g/L chlorantraniliprole suspension concentrate (SC) mixed with the spray adjuvant Yididi-A’on maize plants at the whorl stage. The effects of flight parameters and nozzle type on droplet deposition, droplet density and droplet coverage were analyzed. In addition, the effects of the above variables on the control of S. frugiperda were measured 3 and 7 days after treatment. [Results]  Using a SX110015VS nozzle at a flight velocity of 4 m/s and at a flight height of 2.5 m above the maize canopy, the maximum, normalized, average droplet density was 0.47 μL/cm². However, using a SX11001VS nozzle at a flight velocity of 4 m/s and a flight height of 1.5 m the maximum average droplet density was 79.39 m/cm². Average droplet coverage was the highest using a SX110015VS nozzle at a flight velocity of 5 m/s at a flight height of 1.5 m. [Conclusion]  Flight velocity and height significantly affected the deposition of pesticide droplets sprayed from a UAV over a maize canopy. Droplet deposition was best using a SX110015VS nozzle at flight velocities < 4 m/s at a flight height of 2.5 m. With this spraying regime, the corrected control effect was > 85% 3 and 7 days after application.