This?paper?took?the?Qiupuhe?basin?in?the?southem?Anhui?as?research?object,?and?proposed?a?new?solution?on?theshadow?and?break?line?problems?of?water?body?extraction?in?the?mountainous?area?based?on?0LI?images?and?DEM?data.?Fisly,SWI can eliminate most of mountain shadows by comparing several methods of single- -band threshold, water index of NDWI, spec-trumphotometric and SWI(shadow water index); Secondly, the dilation filtering based on mathematical form and image thinningmethod of Pavlidis were applied to deal with the results of SWI extraction, and the shorter broken line got connection; Finally,for the serious area of water -body broken line in the upstream rivers, DEM was adapted to extract the river network to replacethe extraction result of water index. The results show that the new solution is simple, complete on the planar water extraction,con-tinuous in the linear water and high accuracy of 83%. And it can provide reference of water- -body extraction for other mountainousterrain.