Abstract: Digital Elevation Model provides more diversified techniques for the hydrological analysis. The paper makes use of mean of change-point and bifurcation ratio to synthetically analyze hydrological characteristics and geomorphic features in different area, meanwhile, compared with difference of river network extracted through the optimal threshold and characteristic of bifurcation ratio based on ASTER GDEM. The result indicates that the optimal convergence threshold of the Qingxi river and the Xingzi river are 1500 and 1300 respectively, drainage density of the Qingxi river and the Xingzi river respectively are 0.63 and 0.68; the ability of branch of river through the identical convergence threshold in different basin is the same or similar, but the number of the channel has great difference. The combination of the two factors may provide the necessary theoretical basis in the future.