The life history,spatial patterns and spatial associations across life stages of dominant populations Lithocarpus glaber and Cyclobalanopsis glauca were studied in subtropical evergreen broad-leaved forest at Dashanchong forest farm,Changsha County,Hunan Province,sampling a 1 hm² permanent monitoring plot by contiguous grid quadrate method and making the statistic life tables,figuring age structure and survival curves and using Ripley’s K function.The results showed that(1):The mortality of the two populations increased with size class and reached death peak at juvenile and young stages.The two populations belonged to growing populations and their survival curves were close to type Ⅰ (clump-shaped curve).(2)They aggregated across whole stages with scales from 0 to 25 m and their aggregation strength increased with spatial distance.Meanwhile,the aggregation strength of L.glaber decreased and C.glauca showed from decreasing to increasing with age increasing.(3)Spatial associations of L.glaber and C.glauca populations among different life stages were significantly positive at small scales,which were also found between juvenile and old trees of C.glauca population at more than 15 m scales.The biological characteristics,interspecific and intraspecific competition were important factors in determining the survival ability of L.glaber and C.glauca populations and seed dispersal,sprout regeneration,habitat specialization and negative density effect could be the main driving factors in maintaining the spatial patterns of L.glaber and C.glauca populations.