Abstract: Effects of UV-B radiation on physiology of Cyclamen persicum Mill were studied through indoor simulation experiment.The result showed that:(1)Photosynthesis pigments(chlorphyll a,chlorphyll b and carotinoid)contents increased with UV-B radiation,and decreased with the enhanced UV-B radiation prolonged;(2)Membrane permeability of the leaves were increased by UV-B radiation and increased with the enhanced UV-B radiation prolonged;(3)Flavonoid contents of leaves were increased by UV-B radiation,and the highest value of flavonoid contents were showed in UV-B radiation 40 days;(4)Anthocyanin contents in the petals of C.persicum increased under UV-B radiation.