淄博市洪山、寨里煤矿区隐伏的奥陶系灰岩裂隙岩溶水污染严重。水质污染突发于矿坑全面闭坑以后，污染范围与老窿积水区一致，地下水污染组份与老窿水的高含量组份相同。监测资料表明，老窿水水位明显高于岩溶水水位，二者具连通条件。故水质恶化主要由老窿水串层污染所致。文中针对串层污染形成原因及影响因素，提出了防治对策。 Hongshan, Zhai City, Zhaoli coal mine hidden Ordovician limestone karst water pollution serious. Burst of water pollution in the pits fully closed after the pollution range and the old hole ponding area consistent with groundwater pollution components and the same as the high-content of the old hole water. Monitoring data show that the old hole water level was significantly higher than the karst water level, both with connectivity conditions. Therefore, the deterioration of water quality mainly caused by strands of old water hole pollution. In this paper, the formation of the reasons for the formation of pollution and its influencing factors, prevention and control measures proposed.