Abstract: Since 1958, large area of Yunnan pine forest have been established by aerial sowing in Liangshan prefecture, Sichuan province. Due to the interference made by deviation flow during aerial sowing, large stripes of land were either left out from sowing or sometimes sown repeatadly.This paper tried to made an exploration on the method of revising flying direction to overcome deriation flow in areial sowing. Astrict and correct methematical equation for this purpose has been worked out. If put the equation into programming, we can get the correct revised value of flying angle quickly so as to avoid deviation flow to guarantee and improve the quality of aerial sowing.