The copper tailings from a mine in Inner Mongolia contain 0.14 % copper,which are worth recovering.Based on the mineral composition and dissemination characteristics of copper tailings,experimental study on copper tailings re-concentration was carried out.The copper was recovered by the pre-grading-coarse grain regrinding-flotation process,and the condition test was optimized,determining grading grain size to be 0.045 mm,joint collector to be 38 xanthate＋Y-89,coarse grain grinding fineness of -0.074 mm accounting for 80 %,the dosages of ore pulp modifiers that are lime and sodium hexametaphosphate to be 600 g/t and 800 g/t respectively,and the sodium silicate dosage to be 400 g/t.Under optimal conditions,the final closed-circuit test obtained copper concentrate with copper grade of 19.01 % and copper recovery rate of 34.19 %,which is good index.