Mainly considering the demand of regional soil erosion and hydrological modeling , the DEMs generated from TIN and Hutchinson’s method (ANUDEM) , and their representation of the hydro2geomorphology charac-teristics have been compared. The results show that , in the TIN DEM , there are inevitably flat hilltops , some eroded gullies have been ignored during TIN const ructing , the stream networks based on the DEM is not continu-ous , and multiplelines rivers exist . In Hutchinson method based DEM , the DEM derived contours match to the o-riginal input contours , and the relief and slope can be represented smoothly and continuously. Therefore , the hy-dro-geomorphological features can be represented correctly even no rivers input to drive ANUDEM.