Abstract: Survivorsship data of tree class，size-survivorship curves and quantitative dynamics are used to analyze population dynamics of Cunninghamia lanceolata,Schima superba and Castanopsis rgesii in natural Chinese fir-and-broad-leaved mixed forest.The resuhs show that as the result of complete tree class．populations of Srhinla superba and Castanopsis fargesii belong to ripe populations；because of many seedlings and small sapling under canopy，populations of Schirna superba and Castanopsis fhrgesii also belong to increasing populations；because of complete tree classes，and seldom seedlings and small sapling under canopy，population of Cunninghamia lanceolata belongs to a ripe population and a declining population．