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Aerial spray technology has the advantage of timely and efficient prevention of large area of forestry pest. Electrostatic technology can reduce the droplet drift, improve the effective utilization of pesticide. The aerial spray technology and electrostatic technology applied in forestry pest control has a broad prospect. Light aircraft in agricultural aviation field with convenient, can be achieved at low altitude flying spray characteristics. This paper has developed a new generation of aerial electrostatic nozzle and air electrostatic high voltage generator. The new development of aerial electrostatic spraying system is matched with type B-0061 bee aircraft. In Liaoning Province, Chaoyang District application test was carried out by deltamethrin against pine caterpillars. Comparison of traditional fan nozzle with aerial electrostatic nozzle performance parameters and Application of the two kinds of different nozzle atomization of overwintering pine caterpillars control effect are tested. Control of the area amounts to 2000 mus in test. The test results show that comparing Aerial electrostatic spraying with normal aerial spray using fan nozzle, droplet deposition average improves of 18unit / cm2. Applying aerial electrostatic spraying is Not only the short operation time and every hectare of pesticide use reduces the volume of 5.22 liters and effective prevention and cure rate increased by 33.8%.