Abstract:In mining process, in order to solve some problems of high mining cost and difficulty in disposal of solid wastes such as tailings and waste rocks.Used waste rock and tailings as materials to conduct orthogonal test to explore the effects of mass concentration,cement content and waste rock content on the fluidity and mechanical properties of cemented coarse aggregate backfill then determined reasonable proportioning parameters that can be applied in industry. The results show that three factors, the mass concentration, the amount of waste rock and the ratio of cement to sand, significantly affect the slump of filling slurry while the mass concentration is the most important factor. The results of variance analysis show that the mass concentration and cement content can significantly affect the 3d and 28d compressive strength of the backfill.but the content of waste rock (5%~20%) has no significant effect on the compressive strength of coarse aggregate backfill.The multiple linear regression model can accurately reflect the variation law of compressive strength and collapse of cemented coarse aggregate backfill,and the three-dimensional visualization model can directly reflect the influence of mass concentration, lime sand ratio and waste rock content on the performance of backfill. Based on the established optimization model of filling proportion parameters, a group of reasonable ratio parameters can be obtained as follows: lime sand ratio is 1:9.5, mass concentration is 80%, and waste rock content is 20%.