Grid based DEM is a critical basic geo spatial data base in the analysis of regional topography feature. 1:250000 map scaled DEM is regarded as an important basis for the middle scaled investigation of soil erosion characteristics. Taking three areas of different terrain roughness as test areas, the effective procedures and methodology for the producing of DEM are probed into. In addition, by means of comparative method, the DEM accuracy were investigated, which can be regarded as possessing critical importance for the setting up DEMs, as well as evaluate their practicability and applicability in the field of regional soil erosion research in these corresponding areas.