In Fankou Lead-Zinc Mine,tailings or cemented tailings are used for filling. Since the filling aggregates are usually classified tailings,its production rate and utilization rate are quite limited. Moreover, separation of cement and tailings in the fill slurry results in cement loss, leading to severe inadequacy of fill supply. Therefor, a new approach mest be sought to tackle these problems. A new technology of cemented filling with high concentration and corresponding equipment unclassified teilings are developed and offer solutions to these problems. The technical process and field industrial tests of this new technology are described in this paper. The filling quality and economic profits are dis cussed and evaluated.