Abstract: The microspores of Cycas panzhihuaensis form in early April. After their formation, the microspores take the first mitosis, forming a small persistent prothallial cell and a larger antheridial initial. Then,the antheridial initial is divided, froming two unepual cells, a tube cell and a generative cell. The mature pollen is shed form the microsporangium at the end of April or the early May. The megaspore germinates around April 20th. It begins with a period of free nuclear division and the size of female gametophyte has been formed. The pollen grains begin to germinate in the pollen chamber 3 days after pollination. Sixteen days latter, the pollen tube grows and its length 20 cm, and meanwhile two archegonia begin to develope at the edge of female gametophyte in the micropyle end. In the early of June, the archegonium is typical, it is composed of two neck cells, a central cell and a jacket layer. The central cell enlarges and app roaches its full size in the middle of July, its length is 1.51mm and its diameter 0. 5-0. 7mm.