In this paper， AGREE algorithm was applied to extract the geomorphic features. The system adjusts the surface elevation of the DEM to be consistent with a stream， which is formed hydrological digital elevation models integrate digital elevation models. Analysis was on the topography parameters derived from different catchment threshold (0.2km2 ， 1km2 ， 2km2 ， 3km2 ， 4km2 ， 5km2 )， different scales (1:10000， 1:50000， 1:250000)， and different areas of the standard basin (0.2km2 ， 1km2 ， 2km2 ， 3km2 ， 4km2 ， 5km2 ). The result shows that the topography parameters do not change with catchment threshold， scales and area of the standard if the river orders is 5.