At present, aerial spraying as an important symbol of agriculture aviation has attracted widely attention because of the rapid development and application.In order to find out the distribution regularity of droplets deposition of small unmanned helicopter in rice plants, and the different of aerial spraying and artificial spraying, spray test was studied the effect of different operation parameters on the distribution of droplets deposition, and compared the spraying efficiency and effectiveness of aerial spraying and artificial spraying.The distribution regularity of droplets deposition was obtained with drawing the operation trajectory by BeiDou Navigation Satellite System, the mass fraction of 5‰ Ponceau 2R solution instead of growth regulator to spray, paper card collecting droplets and the image software of Deposit Scan analyzing the parameters of droplets deposition.The analysis results showed that: For two types of unmanned aerial vehicles,the flight height and speed has a different effect on droplets deposition because of the different of rotor wind field, but there is the same trend about the influence of flight speed on deposition rate and flight height on penetrability.It showed that droplets deposition rate of slower speed is more than the rate of faster speed, and droplets penetrability of higher height is better than the droplets penetrability of the lower height.For artificial spraying, the uniformity and penetrability of droplets deposition are poor, and the coefficient of variation of penetrability was 110.42%.For the spraying efficiency and effectiveness, aerial spraying is better than artificial spraying.The results had fully revealed the effect of operation parameters and wind field on the distribution regularity of droplets deposition, and the different of aerial spraying and artificial spraying.It also has an important guiding significance for the reasonable spraying, the spraying efficiency increasing and the promotion of aerial spraying.BeiDou Navigation Satellite System BeiDou Navigation Satellite System BeiDou Navigation Satellite System.