The cyanidation tailings produced after extracting gold and silver from a complex polymetallic gold concentrate by direct cyanidation process are Au 1.20 g/t,Cu 0.52 %,S 47.50 % and Fe 41.02 % and have high recovery value.Under optimal conditions,reduction roasting-slag flotation process can obtain good gold and copper recovery index:gold and copper concentrate productivity is 9.52 %,gold and copper grades are 15.20 g/t and 6.82 % respectively,recovery rates are 76.16 % and 78.20 % respectively;iron concentrate productivity is 90.48 %,iron grade is 65.80 %,and recovery rate is 95.26 %.The comprehensive recovery of valuable elements such as gold,copper,sulfur and iron from the cyanidation tailings has been realized with remarkable economic and social benefits.