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　　Summary of content:Once in Chinese history, it was a country of Dorin，Analysis of ancient times 4000 years ago after research，Forest coverage rate is as high as 57%。Where，Forest coverage in the southeast region is as high as 80%-90%，Some areas are even as high as 90%; the forest coverage in the Northwest region is below 26%。With the development of human society history，Not only is the forest resources become increasingly reduced，Forest structure and its regional distribution are constantly changing。By the early period of the Northern Song Dynasty around 1000 AD and the middle and late Southern Song Dynasty around 1200，Forest coverage is reduced to about 42%and 40%, respectively。But only about 2.05 million square kilometers from the region of the administration of the Southern Song Dynasty，Forest coverage is still about 65%at the time。but but，Even in the Southern Song Dynasty，The distribution of forest coverage in different regions and their changes also have a large difference。The main reason for the changes in the distribution of forest coverage rates in different regions of the Southern Song Dynasty is in order to destroy the forest and reclamation waste，Building materials，Rebellion Consumption，car and boat、Furniture、Farmers and coffin and other wooden artifacts，Mining Metallurgy、Materials for cooking salt and firing porcelain，Plank road construction and the felling of forests in the war of war。From the perspective of the overall ecological environment，The Southern Song Dynasty is still in a relatively good ecosystem balance stage。

Zhang Quanming，Professor of History and Culture College of Huazhong Normal University。email: zhangqmlaoshi@126.com