中文摘要：

本文以喀斯特后寨河流域为例，探讨了在Arcgis9．0环境下从数字高程模型（DEM）中提取流域特征的详细过程，包括：DEM的生成和预处理、水流方向的确定、汇流累积量分析、河网的提取和子流域的划分以及落水洞的计算。经分析得到了研究区域河网特征以及研究区其他常用的流域特征信息，与实际河流水系特征基本吻合，从而证明该方法在分析流域的河网水系结构特征时具有一定的应用价值。

英文摘要：

In the case of Houzhai river basin, Puding County, GuiZhou, the author studied the detailed procedure of extracting basin features from DEM, including the building and pretreatment of DEM, definiting the flow direction, analyzing the flow accumulation, calculation of sinkhole, extracting of river network and division of sub-watershed. The author got the information of the features of the river network and other basin features after analysis, the result was similar to the actual features of the river network. This suggested that this way was valuable for extracting river network from DEM.