Watershed hydrological model has become an important means of extraction hydrological information. The paper studied Songhua river basin based on SRTM DEM with 90 m resolution and 1:250,000 river vector data. Arc Hydro model has been applied to extract river network on different catchment area threshold of 400, 500 and 600 km2. The image alignment software such as Alike Duplicate Image Finder has been used to analyze extraction accuracy of river network. The results show that the river network is accurate when the catchment area threshold is 500 km2. Arc Hydro model is used to generate 642 sub-watersheds when the catchment area threshold is 500 km2.The river network of Songhua river basin extracted by Arc Hydro model is consistent with the actual one, which shows that using the model to carry out hydrological information extraction is reasonable.