To describe the seedling and sapling distribution patterns of a spruce-fir coniferous and broadleaved mixed forest in the Changbai Mountain area, one sample plot covering 60×60 m was established. The spatial coordinates, diameters at ground height (DGH) and heights (H) of all trees with a height exceeding 30 cm and a diameter at breast height (DBH) less than 5 cm were measured. Based on these data from the sample plot, by the method of point pattern analysis, and the univariate O-ring function statistic was used to analyze the spatial patterns of the main regeneration tree species.The bivariate O-ring function statistic was used to analyze the spatial correlations among different regeneration tree species.The following 15 tree species were recorded in this plot: Abies nephrolepis, Picea asperata, Pinus koraiensis, Betula platyphylla, Betula costata, Tilia amurensis, Acer tegmentosum, A. mono, A. ukurunduense, Populus davidiana, Phellodendron amurense, Taxus mairei, Quercus mongolica, Fraxinus mandshurica and Ulmus japonica. The following 7 regeneration tree species were recorded: Abies nephrolepis, Acer mono, Tilia amurensis, Picea koraiensis, Pinus koraiensis, Quercus mongolica and Ulmus japonica.Abies nephrolepis and Acer mono are the most common species, which account for 87.40 percent of total, while Tilia amurensis, Picea koraiensis and Pinus koraiensis take second place, which account for 12.25 percent of total. Only few Quercus mongolica and Ulmus japonica were encountered, which account for 0.35 percent of total. The number of individuals decreased with increasing dgh and height of the regeneration tree species. The distribution of ground diameter follows the shape of an inverse J.The distribution of heights shows a bimodal shape.Abies nephrolepis and Acer mono show an aggregated spatial distribution at distances between 0 and 10 m. With increasing scale the distribution of all regeneration trees is uniform at first, then random. Tilia amurensis, Picea koraiensis and Pinus koraiensis are mostly randomly distributed at all scales, perhaps because of the limited number of these three tree species.Generally, the associations of regeneration tree species show positive correlations at small scales and negative correlations at larger scales.With increasing scale, the correlation intensity is declining. Abies nephrolepis and Tilia amurensis, and Picea koraiensis and Tilia amurensis, do not show a positive spatial correlation; The spatial relationship between Abies nephrolepis and Picea koraiensis, and Abies nephrolepis and Pinus koraiensis is not negative; There are no obvious spatial correlations between Picea koraiensis and Pinus koraiensis.