Abstract: The stomatal behavior of both Adenophora lobophylla and A. potaninii was studied in this paper by means of shading experiment. With effect of different shade treatment on the stomatal physiological character and ecological adaptation of both A. lobophylla and A. potaninii being compared.The main results are as follow: compared with A. lobophylla, A. potaninii has showed strong of drought resistant and adaptive ability for different shade treatment. The stomatal open of blades for A. potaninii cut down gradually and part of the stomata closure in noon in nature light and light shade. The stomatal restriction for A. potaninii in photosynthesising was more evident, so was the non-stomatal restriction in photosynthesising for A. lobophylla.

Key words: A. lobophylla, A. potaninii, shade treatment, stomatal behavior