Abstract: This research investigated the Artemisia arenaria population in the middle and lower reaches of Shiyang River basin. By using the volume structure theory, we classified the age structure of Artemisia arenaria population, mapped the survival curve and static life table, and analyzed the age structure and dynamic condition of Artemisia arenaria population. The main results are as follows: (1) the individual number of young Artemisia arenaria population is large, of middle-age class is stable, whereas of senior-age is less due to the effects of interspecific competition and environmental factors; (2) the survival curve of Artemisia arenaria population exhibits a tendency of Deevey-Ⅱ type; with regard to the dynamic performance, it shows an early-stage growth, medium -term stable condition and late-stage recession; (3) the function of survival rate of Artemisia arenaria population decreases monotonically, whereas the function of cumulative mortality increases monotonically. The curve of morality density is relatively flat，and the function of hazard rate demonstrates a progressively increasing trend with the increasing age class.