Abstract: Movement characteristics of spray droplets in air environment under inclined conditions were concerned as the engineering background in this paper. The momentum equation of a single droplet under inclined conditions in air environment at room temperature and pressure was established to analyze the influence mechanism of inclined angle, injection angle, droplet diameter and initial velocity on droplet trajectory. The results show that the transverse span of the central section with the vertical distance of 50 m from the initial position is about 5.5 m at the initial condition of 45° injection angle and 30° inclined angle. The larger inclined angle, the smaller droplet diameter or the smaller initial velocity give rise to the smaller coverage. If the initial droplet injection angle is larger, the droplet diameter is smaller or the droplet velocity is smaller, the influence of inclined angle on the droplet injection coverage will be smaller. The results also show that the droplet diameter has a significant effect on the time from initial state to maximum displacement, while the initial velocity, injection angle and inclined angle have limited effects on the time from initial state to maximum displacement of the droplet.