Abstract: Through analyzed the character structure of mixed coniferous and broadleaf stands, poplar-birch forest and Quercus mongolica forest after closed forest that badly destroyed in Xiaoxing'an Mountain, it showed that closed forest is an effective method to promote the forest vegetation recovery, after closed forest, the vegetation recovery very fast, the height, cover rate of vegetation and number of genus also change very much, especially the vertical structure have evident changed. From the analysis of physical and chemical characters of the soil, it showed that after closed forest the percentage of moisture and humus in soil increased greatly.

Key words: closed forest, community, character