Abstract: he following issues related to the Picea-Abies forests of the range have been studied in this paper:1) Environmemtal settings; 2) Ecological attributes of the major tree species of the sprucde-fir forests; 3) Species composition and structure of each vegetation type of the forests dominated by Picea koraicnsis, P. jezoensis and Abies nephrolepis; 4) Disturbance factors influencing the forests; 5) General successional patterns and processes of the spruce-fir forests of the northeast China.

Key words: Ficea-Ables forests, Vegetation type, Disturbance factor, Community dynamics