Aerial application has characteristics of low-volume, small droplet, and possibility of drift. To control rice planthopper, leaf roller and blast, the research aimed at screening agrichemicals and determining the feasibility of using high concentration of conventional dosage for aerial application. The results showed that higher concentration of imidacloprid WP, ME, WG, carbendazim WP and Jinggangmycin were safe for rice; while chlorpyrifos EC, EW, showed significant phytotoxicity. The results of UAV application showed that the droplets in the lower leaves of rice were 92.8 % of those in the upper leaves, which was significantly higher than conventional ground application. The amount of spray drift was 12.9 % of the total spray amount at the flight velocity of 3 m/s and wind speed of 4-5m/s. A 90 % of the spray drift from the spray area was concentrated in the range of 8 m. The spray drift in the air was zero at a distance of 50 m. In the control efficacy field trails, we found that 80 % of the conventional dosage gave the best control effect.