Rhodiola fastigiata is national second-class protected species and in approximately endangered states in China. Increment in length and diameter of rhizome per year were measured using vernier caliper(IP54 type)through observing the scape rings formation of 12. fastigiata in different altitude areas of Tibet Sejila Mountain, and then the growth characteristics of rhizome were analyzed to determine the age. The results showed that:R. fastigiata form one scape rings in the rhizome yearly,furthermore,there was no significant difference in lengt...