The rice is the main and supreme food crop in China, but all aground boom sprayers are very difficult droved in the waterish field because of the depth of wet-soil with water.Because the immigration of Chinese young farmer generation from farmlands to the city, there are significant lack of labors problem in Chinese countryside, The small unmanned aircraft application techniques and equipments are useful developed in China in past years, a plentiful different type of small remote controlled unmanned aerial vehicles (UAV) with 5-30 l liquid-tank and 5-20 m spraying swath under different application condition from China were used for the rice field chemicals control.In this paper, small single-and multi-wings unmanned aircraft vehicles were compared for pest control in Jinxian farm station in southern Chinese Jiang Xi province.The dosage volume of pesticides CORAGEN was sprayed 7.5 L/ha, the biological control efficiency of CORAGEN and the influence of application parameters of UAV on droplets deposition in the canopy of rice during the whole vegetative period was researched.The results showed: the small UAV is ideal for small plots in Chinese rice field and efficient rice pest control;the deposition of chemical droplets on rice canopy from small multi-wings UAV sprayer was more uniform and high than single-wing UAV.The optimum application parameters of small UAV were that flight altitude was 2-4 m and flight velocity was 1-3 m/s and biological efficiency of CORAGEN against rice stem borer was significant to reach more 90% compared with blank control.