Based on analyses of the characteristics and causes of soil and water loss in Quanzhou city, Fujiang province, it is clear that the frequent typhoon and rainstorm, and geographical characteristics of mountain and hills, are the strong potential erosive power.The low resistant erosion ability of ground substance, especially the development of granite weathering crust is the inner cause of severe soil and water loss.And the human unreasonable land use, such as vegetation dest ruction, slope land cultivation, cultivation down the slope and the basic economic constructions, is the primary causes of soil and water loss.It is necessary to reconst ruct slope land, and carry out soil and water conservation tillage measures. What is more, comprehensive control in the small watershed as a basic unit is needed in order to control soil and water loss effectively.