Ceiling fan was used to simulate helicopter to produce down blowing airflow, which was applied in design of a pollination device blowing katabatic airflow. Then total amount of pollens, pollen density, horizontal and vertical distributions of pollens were appraised to analyze the effects of down blowing airflow on the distribution of rice pollen during pollination. The results showed that the total amount of pollens, pollen density, pollen horizontal and vertical distributions increased with increasing velocity. When the air velocity is below 1.12 m/s, the propagation distance of pollens is 0.42 m. Total amount of pollens and distribution ranges under velocity of 1.85 m/s were obviously increased compared to those under velocity of 3.23 m/s, with total amount of pollens increased by 413 pollens and the percentage of effective pollen distribution area increased by 20.35%.