Abstract: Soil erosion occurred in the low granite hills and flatforms in middle Shenzhen area.It is divided into intensity(9100T/KM².year),moderate(6500-9100T/KM².year) and light(2600-6500T/KM².year),based on the erosion modulus calculated by observing the tree roots laid bare above the ground,in combination with the present conditions o f soil erosion.The distribution of main severe erosion areas and their characteristics were described in this paper.It is considered that the improper human activities,such as deforestation and cultivation on the steep slopes in hilly areas,as "well as excavation in constructing highways and dams are the main factors to cause severe erosion.Natural conditions such as the weathering layers,rainfall and topograporaplay an important part in this process.