Abstract: Taking four varieties of Ricinus communis that were Zhongbei No.3, Jinchangcheng No.5, Fenbi No.1 and Xiubi No.1 as materials to research the correlation between pollen viability with temperature, storage humidity and acquisition time, the results showed that the most suitable temperature for castor pollen germination was 30-35%, and the pollen germination rate reached 75.12%-80.24%; The strongest time of pollen germination in one day was in 8：00 to 14：00, and the pollen germination rate reached 81.35%-90.18%; The optimum humidity for pollen collection and storage was 45%-55%, and the pollen germination rate reached 84.03%-88.01%.