Abstract: In this paper, the flowering period of three American Lagerstroemia indica varieties （Red Rocket, E. Ember, Delta Blush） introduced in the hilly area of central Sichuan was observed and their pollen germination ability was compared. The results showed that all three American Lagerstroemia indica species entered the flowering period at the end of July or the beginning of August, and the flowering period could be met. The flowering period was shorter than that in Hunan province, the original introduction place. All the pollen grains in the long/short capillament anthers of the three varieties could germinate normally, and the germination rate of pollen grains in long-capillament anthers was higher. Therefore, both types of anthers could be used as hybrids to provide pollens. All three varieties could be self-cross and outcross. When self-cross, pollen tubes and sperm cells could enter the ovary for 12 hours, while when outcross, it need 14 to 18 hours. The related research laid the foundation for the development of the next hybridization experiment.