以秦淮河流域为例,阐述了Arc Hydro Tools提取流域河网的步骤和方法,分析了有(无)河网辅助条件下提取数字河网的效果,并探讨了利用Arc Hydro Tools提取河网水系的特征,提出了基于ArcGIS Hydrolo-gy模块直接处理DEM数据的改进方法。结果表明,该方法有效提取了研究区域内的河网特征,与实际流域边界基本吻合。 Taking Qinhuai River Basin as an example, the paper introduced the steps and methods of Arc Hydro Tools to extract river network, analyzed the effect of extracting digital river networks with (no) river network aided condition, and discussed the use of Arc Hydro Tools to extract river network , An improved method of directly processing DEM data based on ArcGIS Hydrolo-gy module is proposed. The results show that this method effectively extracts the characteristics of river networks in the study area and basically coincides with the actual river basin boundaries.