In order to understand the relationship of groups of Subgen. Cercidothrix, we investigated the leaf epidermis of 6 species from different sections by the light microscopy (LM) and the scanning electron microscopy (SEM). The result shows that: (1) the densities, length, arm ratio of trichromes from different species are quite different. All leaves of species are hairiness except upper epidermis of A. leansanicus and A. bhotanensis, and hairs of lower epidermis are denser, hair arm ratio is between 1.22 to 2.15. The length of trichromes is between 104.7 μm and 902.0 μm, the length of trichromes of one leaf is between 200 μm and 400 μm, but there is no obvious difference between upper and lower epidermis. A. bhotanensis have the shortest hairs which average length is 195.5 μm; A.kifonsanicus have longest hairs which average length is 781.6 μm. (2) The stomatal frequency, the shape of the epidermal cells and the anticlinal walls of different species are not the same. The anticlinal walls of A. discolor and A. bhotanensis are straight, while A. leansanicus and A. kifonsanicus are significant sinuate, and A. adsurgens and A. scaberrimus were intermediate. The corresponding epidermal cells are polygons, irregularity and nearly polygons respectively, which can be used for species identification. (3) Under SEM, the characteristics of these species are almost the same: the trichromes are cylindric，with papillae or striation ornamentation on surface. Waxy layer of epidermal cells are textured flake. Inner margin of outer stomatal rim was nearly smooth or sinuolate, while the stomatal of A. bhotanensis is surrounded by “T” type thickening of guard cells. (4) The stomatal frequencies and densities of six species under different environments shows that A. bhotanensis from waterside have the largest stomatal frequency, 336/mm²，but the stomatal frequencies of A. kifonsanicus from arid areas was the lowest, 120/mm² and the upper and lower epidermis were the same. This is inconsistent with the results of previous studies.