Abstract: To further explore the Qinghai-Tibet Plateau plant distinctive physiology structure and its environmental adaptability, the anatomical structures of Capparis spinosa L. from 4 000 m altitude of Zhada in Tibet were studied by the methods of paraffin section. The results showed that the anatomical structure was highly adapted to its environment of mountain desert grassland: periderm of secondary root is developed, the cork is thicker, there is a larger proportion of secondary xylem; There are epidermal hairs and obvious cuticle on the epidermis of stems, and also developed collenchyma tissue, pith is narrow in stems; The leaf is isobilateral with multilayer palisade tissues. Dense stomata exists and significant cuticles are existed in epidermis; Corolla is larger with white petals, which is suitable for insect pollination; Parietal placentation with much ovules in each locule, extine is thicker which can resistant to corrosion, acid and alkaline. All of the characteristics of C.spinosa L. described above result from Qinghai-Tibet Plateau stresses of extremely ecological conditions, such as high irradiance, cold temperature, low air pressure in the Qinghai-Tibet Plateau, as well as the adaptations of the C.spinosa L. to the Qinghai-Tibet Plateau environments.

Key words: Tibet, Capparis spinosa L., anatomical structure, adaptation