Abstract: To study the characteristics of the flower bud differentiation of Phyllagathis fordii, an improved paraffin dissection method was adapted for amorphologic observation. The result indicated that the differentiationsinitiated from the external of a bud, starting on inflorescence primordiumfollowed by flower primordium, sepal primordium, petal primordium, stamen primordium, and finally, pistil primordium. The annual flowering season of P. fordii in Zhangzhou area lasted from February to August. It took approximately 30 days to complete one differentiation cycle.