In order to explore the influencing factors of water loss rate per unit time during rapeseed drying, the optimum drying technological parameters of rapeseed under whirlwind drying were studied. The drying experiments were also carried out by using the self-made whirlwind drying machine of rapeseed. The singleand multi factors rotating orthogonal tests were undertaken by choosing the main factors including drying temperature, air velocity and the diameter of the inner diameter of the whirlwind dryer. The single factor test showed that the drying temperature, the air velocity and the diameter of the inner hole of the whirlwind dryer were the three main factors that affected the water loss rate per unit time of the rapeseed: The drying temperature is 70～90 ℃, the air flow rate is 17～22 m/s, and the diameter of the inner hole of the classifier is 130～140 mm. The multi factor test on the other hand showed that the significant factors affecting the water loss rate per unit time of the rapeseed were in the order of Drying temperature, airflow speedand classifier inner hole diameter. It was also found that the optimum drying technological parameter of rapeseed in whirlwind mode drying at 85 ℃, with airflow velocity 19 m/s and grading hole diameter 136 mm. The research provided a theoretical basis for the drying process optimization of the rape whirlwind dryer.