Abstract: The analyses of the epeirogenic process of the coastal plain in Wunzhou district since the Tang and Song dynasties show that the epeirogenic process has the following characteristics. The epeirogenic process was basically confined to the section between the South and North Yandang Mountain and several branch ranges from east to west. The epeirogenic sepuence of the same river was southwest first northeast second. In general the epeirogenic process cf the coastal plain in Wunzhou district is very slow. In the long historical period land only advanced ten or twenty kilometers. Since the Ming and Qing dynasties agricultural development and forest felling caused forest destruction and soil erosion to accelerate the epeirogenic rate of coastal plain continually.