Abstract: Carbonate rocks are widely distributed in Zhongtiaoshan area, where annual precipitation is 740 mm, mean annual temperature is 14℃. The climatic conditions and multiple tectonic movements controlled anddetermined the development of karst, geomorphologic landscape, and theoccurrence and transportation of ground water through karst. Here thepercolation becomes an outstanding engineering geological problem inwater conservancy and hydropower construction and has a certaininfluence on dam sitting.