Abstract: With increasing application of electrostatic spraying in plant protection, its performance is closely related to charging effects of spray droplets．Charging performance and influencing factors of fan-shaped electrostatic induction spray droplets were investigated．High-speed cameras were employed to capture liquid film morpology, and a simulation model of electrostatic field for a fan-shaped nozzle was contructed to analyze effects of electrode spacing, length, width, and position on droplet charge efficiency．Results revealed that electrode spacing exerted the greatest influence on surface charge density of liquid film, followed by electrode length and position, while electrode width had the least effect．Optimal charging performance was achieved with an electrode spacing of 2 mm and a length of 10 mm, yielding a surface charge density of 1. 522×10⁻⁵ C/m²．Furthermore, charging effect reached its peak when electrode width was slightly greater than liquid film（18 mm）, resulting a surface charge density of 1. 605×10⁻⁵ C/m²．At an electrode position of –1 mm, a surface charge density of liquid film was 1. 584×10⁻⁵ C/m², demonstrating the best charging effect．Reference for structural optimization design of electrode systems in fan-shaped electrostatic spraying device was provided．