Vertical mills are efficient in grinding,cost less electricity and consume less media.The paper introduced the structure and working principles of the vertical mill and its application to the flotation gold concentrates regrinding process in the cyanide leaching plant of Jinchiling Gold Mine.The optimal working conditions are settled through production practice:the working electricity current is 19-22 A,the grinding concentration is (75±5)% and the packing rate of the media is 28 %.Compared to conventional horizontal ball mill,VTM-400 vertical mill can greatly improve grinding performance.The percentage -38 μm accounts for increases by 8.30 percentage points,the gold leach rate increases to 98.55 %,unit consumption of steel balls decreases by 2.42 kg/t,electricity consumption decreases by 23.34 kW·h/t,operation cost is saved by 3 949 400 yuan/a.