This paper studied the development of female flowers and embryo in Dioscorea fordii Prain et Burk., and laid the foundation for it on the study of embryology and hybridization breeding. The results showed that: most of D. fordii Prain et Burk. was dioecious, and female flowering period was about 3 months in Hainan, from early September to the end of November. There were three rooms in its ovary, and two anatropous ovules in each room; The ovule was crassinucellate and bitegminous. The archesporial cell under the micropyle epidermis gradually developed into megasporocyte mother cell. Then the megaspore mother cell underwent meiosis and formed 4 megaspore in line, and only one of megaspore developed into functional megaspore. The mature embryo sac was Polygonum type with 7 cells and 8 nuclei. The fertilization of egg cell was premitotic type. The development of embryo was onagrad type, and went through 5 development stages, including two cell proembryo, inverted T type proembryo, globular embryo clavate embryo and pear shaped embryo. The development of endosperm was karyotype.