Abstract: Chengde was an imperial summer resort situated in the northern part of Hopei province and Weichang, located at the north of chengde,was an enclosure for hunting feild during the Qing Dynasty (1702A.D-1906A.D).As this area was preserved for the emperors to hunt, explortation was prohibited until the middle stage of the Qing Dynasty. Intensive agriculture has been undertaken only for 300 years.But the misuse of the surrounding mountain area has brought great changes to the vegetation and ecolgecal environment there, such as deforestation for farmland and fuel, desertization in the grassland and serious soil erosion.This paper tells breifly the natural history of the vegetation in the area and discusses the relationship between the agricultural development and the changes of the environment.