Abstract： There are various environmental-geological problems in the Nansi Lake drainage area. Problems including water pollution, geological disasters of mines, environmental abnormity of groundwater, siltation of Nansi Lake and endemic diseases are discussed. Coal mining has an active influence on the evolution of Nansi Lake. The lake and main rivers flowing into the lake have been highly polluted under the influence of anthropogenic activities. Environmental geological hazards caused by development of local coal resources are very serious in the drainage area. The surface collapse area in the drainage area is up to 112.395 km2. The amount of various solid waste totals to 64.1268 million tons, covering over 595.13 ha. Groundwater resources in the mine district have been destroyed badly due to a large amount of mine drainage. Endemic fluorosis and chronic keshan disease are the main endimic diseases due to the high concentration of fluorine in shallow-layer groundwater and lack in selenium in food and water respectively. On the basis of a comprehensive analysis of these environment-geological problems in the drainage area, measures for environmental control have been put forward in detail in the paper and various influencing factors should be considered in treating environment-geological problems in this area.