Abstract: In this paper, studies were made of reactions of B. papyrifera seed germination to temperature and water stress by means of the artificial simulation method. The results showed that the germination rate and germination index were the highest in 20/10℃, which reached 90% and 19.04, and 20/10℃ was the suitable germination temperature; the water potential range was 0~-0.6 MPa,and as the water stress aggravated,the germination percentage and germination speed would decrease. When the water potential was below -0.86 MPa,seeds could not germinate.