The spatial pattern of seedlings plays an important role in community regeneration. Our study was based on 415 seed-seedling census stations established in three large permanent field plots,each representing one of three successional stages in a conifer and broad-leaved mixed forest. We conducted three censuses from 2012 to 2014 for seedlings < 1 cm in diameter at breast height and analyzed the quantitative distribution of woody seedlings and the spatial relationship between seedlings and adult trees for four major species:Fraxinus mandshurica,Acer mono,Abies holophylla,and Acer mandshuricum. The Syrjala test was used to analyze interannual differences in the spatial pattern of the number of individual seedlings and the number of seedling species at the station level. Our results indicated that(1) there were obvious differences in the quantitative distribution of woody seedlings among communities and years. Seedling density exhibited substantial spatial variability at the station level,whereas spatial heterogeneity of seedling richness was low. These results indicated that spatial heterogeneity of seedling distribution had an important impact on seedling density.(2) Spatial pattern of the number of individual seedlings and the number of seedling species varied among years at the station level. This demonstrated the influence of seed production,dispersal method,and community composition on the spatial distribution of seedlings.(3) Judging from the spatial relationship between dead seedlings and adult trees,dead individuals of the four major seedling species exhibited a similar distribution pattern with that of adult trees,which indicated that the distribution pattern of adult trees might affect the distribution pattern of seedlings,. It further confirmed the negative density dependence of the spatial pattern of seedlings.