Abstract: Based on the static life table , fecundity schedule of Picea mongolica population, the dynamic process of the spruce population, which is representative in Baiyinaobao, Xiaotengeli sandy lands, Inner Mongolia, was predicted using Leslie population model. The dynamics of plants of each age class was expounded. The spruce population on the sandy land was of low increase type. Its net reproductive rate, the intrinsic rate of increase and the increment rate per unit were high, but its generation span and the time of double population size were low. The number of one-year-old plants and total number of plants increased continually, and the change of total number of plants was small in 50 years.