Abstract: An aerial electrostatic spaying system was designed for Y5B aircraft including aerial nozzles, high voltage DC power supply and inlay cylinder acicular induction charging device which can makes spraying droplets more uniformly and droplets charging more effectively and fully. Some experimental studies about aerial electrostatic spraying set were introduced and conducted on the electrostatic spraying system assembled in the Y5B aircraft. These experiments included the effective spraying breadth, droplets deposition characteristics and droplets drift and so on. The results showed that the electrostatic spraying could make coverage rate of target increase 14 droplets/cm2 compared with the non-electrostatic spraying, the effective spray breadth of Y5B aircraft reached 42 m, and droplets drift decreased obviously. Electrostatic spraying could produce uniform and fine droplets with good droplet adhesion and distribution, higher depositing efficiency, low environmental contamination, low pesticide application rate, and aerial spray can improve efficiency for prevention and cure pests in agriculture and forestry. Combining electrostatic spraying with aerial spraying technology will take an important role for preventing and curing pests in agriculture and forestry.