Abstract: The flowering period,the characteristics of floral structure,pollen viability,fructification rate in Robinia hispida L. were studied in this article.The results were as follows：The blooming period was from early May to late August and lasted 100 days;Single inflorescence lasted 7-10 days and single flower lasted 3-5 days.Flowering sequence was from middle part to top and bottom part in a tree,and from bottom part to top part in a inflorescence.The flower was hermaphroditic flower with 10 stamens which included one part of 9 stamens and another part of 1 stamen and 1 pistil covered with white villuses;Stamens matured before pistil.Pollen viability was high as 87% but the rate of fruit setting was 0.