Based on several traditional field investigations in Gonghe basin,Qinghai Province,laser 3D scanner and sub-meter differential GPS were used to monitor the boundary of branch gully erosion in the south of Weiliantan gully head. After the data were collected,point-cloud data processing software-Real Works Survey,AutoCAD,and GIS software were used to compare and analyze the raw data. Results showed that high precision and non-contact measurement of laser 3D scanner could accurately simulate landform surface in soil erosion monitoring. High precision GPS data can be used as part of supplement data in the area where laser 3D scanner can not reach. Moreover,the limitations and improvements of laser 3D scan technology applied in soil erosion research were discussed. Our study is expected to provide a feasible method in the research on soil erosion monitoring.