Abstract: The total reserves of the iron deposit group in Luanhe alluvial plain of Luanxian-Luannan section, including Sijiaying iron orefield, Macheng iron orefield, Kanshang iron orefield, Changyu iron mine and Gaoguanying iron mine, amount to billions of tons. All of them are covered with huge thick Quaternary water-bearing bodies. Mining is impossible due to complex hydrogeological conditions. Being watery unminable metal ore fields, they have been regarded as the water-abundant mining areas that the regional hydrogeological environment might be greatly affected in the exploitation, and labeled as restricted mining areas. It is not until the beginning of the 21st Century that these mines are put into production successively. By analyzing the hydrogeological conditions of the iron deposit group, the paper discusses the hydrogeological characteristics of Luanhe alluvial plain in Luanxian-Luannan section.