The leaf epidermis of Triadica rotundifolia (Hemsley) Esser-endemic plants in limestone region,and of Triadica sebifera,Triadica cochinchinensis were examined through scanning electron microscope (SEM) and light microscope (LM).By comparing the three species,we analyse T.rotundifolia’s environmental adaptive mechanisms based on its leaf epidermic morphological characteristics.The results showed that:abaxial cells of T.rotundifolia were small size reversely,with irregular type and closly arranged.The stomatas could only be seen on abaxial epidermis.The stomatal density and index of T.rotundifolia were lower than that of other two species.Stomatal type was anomocytic without subsidisry cells.Horny layer and wax layer thickly covered on the epidermism,with its waxy coat lamellar and reticulation.All of these implied that T.rotundifolia can adapt to limestone habitats condition.