The community of Fraxinus mandshurica,Quercus mongolica,and Ulmus macrocarpa were investigated to reveal the quantitative dynamics of population.The static life tables were made,and the survival curve,mortality rate curve,killing power curve,and hazard rate function curve by using the age class structure represented by DBH class.The results showed that:(1)The survival curve of F.mandshurica and Q.mongolica population could be generally summarized as the type of Deevey Ⅱ,suggesting stable population dynamics.The survival curve of U.macrocarpa population could be generally summarized as the type of Deevey Ⅲ,indicating the high mortality rate of young trees,then the low mortality rate.(2)The mortality peaks of F.mandshurica was higher in the Ⅰ age class,then increased with the age increasing.The mortality peaks of Q.mongolica mainly were in young and old-age.The mortality peaks of U.macrocarpa was higher in the Ⅰ and Ⅵ age class.(3)The survival analysis showed that the three population mortality rate was increasing all along,while the survival rate was decreasing all the time.The hazard rate function curve was increasing with the growth of age class of F.mandshurica and Q.mongolica.The survival functional curve showed that the individual number of the population of U.macrocarpa decreased rapidly in early age period,was stable in middle age period,and declined in old age period.