Abstract:In Qinling Mountain,4 stands were set up at Taibai Mountain,Guangtou Mountain,Yuhuang Mountain,and Bingjingding Mountain respectively.280 plots in Larix chinensis population were investigated by sampling method.The community feature,size-class structure,and regulation of changing density were analyzed,as well as worked out the survival curve,death curve,and life table.The results showed that the populations had one peak of mortality between 25～30cm,and the survival curve trended to be the type between Deevey Ⅱ and Ⅲ.The populations were stable in large size-class and variable in small size-class.The restricting factor for the survival and development of the population was short seedling.