Abstract:The forest site classification, assesment and its application are the scientific foundations for silviculture and forest management. The paper considers that the forest site classification system in China undoubtty includes the job of site regionaligation for, in fact, the units of site classification are the same units for site regionalization. The principles for establishment of the system and the units of the system are discribed. A scheme of the forest site classification system in China involved 3 site regions, 17 site zones, 55 site areas and 163 site subareas is provided.