Abstract:This paper presents the effect of the slurry concentration and cement-sand ratio on compressive strength and fluidity of high concentration cemented filling. The test results show that improving the slurry concentration and cement-sand ratio is the effective methods to increase the compressive strength of the high concentration cemented filling. Improving the solid concentration and reducing the cement-sand ratio is observed a negative in?fence on the rheological parameters (yield stress and plastic viscosity), which lowering the fluidity. In order to improve measurement precision and mixing effect ,the filling process of batch preparation and continuous filling was designed and applied successfully in an industrial experiment.This research confirmed that the fine tailings could be suitably used as backfill material to fill the underground stopes.