Abstract: Spatial patterns and dynamics of main woody plant populations of survived forest plant communities in Daqinggou are studied by method of Variance/Mean and some indexes of aggregative intensity. Spatial patterns of main woody plant populations are aggregative, Ulmus macrocarpa, Acer mono, Ulmus pumila populations in some communities are random. Results of pattern dynamic analysis are that Fraxinus mandshurica, Phellodendron amurense, Ulmus propinqua, Ulmus macrocarpa population patterns turined to random type from aggregative type in series of seedling, sapling, little tree, middle scale tree and big tree, because of higher tiller capacity, Quercus mongolica population pattern is still aggregative type in big tree stage. The results in this paper also show: the factor which affect population pattern are two aspects, one is biological characteristics of species, the other is intra- and inter- species competition caused by environmental conditions; method of Variance/Mean is better to analyse population pattern.