Abstract:The leaf abaxial epidermis micromorphologic characters of Liriodendron reciprocal cross hybrids and parents were observed under scanning electron microscope (SME). The results are as follows: Liriodendron chinense (Hemsl.) Sarg. and minus crossing F1 have obviously papillar cell in abaxial epidermis, that of L. tulipifera Linn. and plus crossing F1 is flat. Stomatal density of L. tulipifera Linn. And plus crossing F1 are much denser than that of L. chinense (Hemsl.) Sarg. And minus crossing F1. There are no significant differences in abaxial epidermal waxy ornamentation and stomatal apparatus form between hybrids and parents. Reciprocal cross hybrids have larger stomatal apparatus opening than parents′.