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Applications of quadcopter or hexacopter have made easy for plant care. This Unmanned Aerial Vehicle (UAV) technology can accelerate the spread of insecticides, fertilizers, seed sowing, palm pest control, and so on. The translation of air around the UAV needs to be considered to prevent damage of plant. The hit of air can cause broken branch, fall leave, insects to feel uncomfortable, getting into the sidelines of the plant, damage flowers, damage the fruit, or may damage the all plant. The restriction of the wind speed is very useful. The air blows can help pollinate, increasing the air circulation, decrease humidity, decrease the fungi, and so on. For this reason, the distribution of air pressure due to propeller activity needs to be known. This study aims to determine the air pressure distribution, with variations in lift and distance of the measuring point from the UAV propeller. The step of the research is measuring air pressure under a UAV quadcopter which has a total thrust of not less than 10kg. Fifteen air pressure sensors are arranged under the UAV. Four of fifteen sensors are connected to the Digital Storage Oscilloscope (DSO). The propeller which used in quadcopter is 3080 and 2255 with a 120kv-340kv brushless motor. The results of this study can at least be taken into consideration in the operation of quadcopter UAVs, which in this study found that the air pressure difference reached 0.02kPa. This pressure is too large for rice plants.