In the concentration plant of Tongkuangyu Mine, the milling system is deployed correspondent to the flotational system. Once a breakdown happens to the flotational system, the milling system must come to a halt correspondingly. As the flotational system has been commissioned for a long time, technical renovation is imperative. Therefore, the disposition of milling system and flotational system have been renovated technically. Operation of the modified flowsheet shows that the renovation has remarkably enhanced the availability of the milling system and the productivity of the flotational system, leading to good economic return.