Abstract: Dynamic observation of experimental topography is important for research of erosion process and mechanism. This study presents a device, MX2010G topography meter, to measure the dynamic erosion processes, and compares the results on the same slope observed by the device and other conventional meters, respectively. A series of detailed tests on the observing performance of the device were operated. For the landform model with volume of 24000cm³ and different slope gradients, the relative errors of observed volume can be controlled within ±10%, of which the maximum absolute error is 9.0%, and the minimum absolute error is -0.4%. In the range of 120cm×140cm, the coordinate errors of ten selected points for x, y, and z axis are 0.99,0.84 and 0.42cm, respectively. In the linear regression analysis for elevations of the selected points in the 6 sections, both of the regression coefficient b and relevant coefficient R² are close to 1. As a conclusion, the MX2010G topography meter may be used for precise measurement on the gully wall.