Abstract: The trouble with the plant is the instability of the 3-product H. M. cyclone system in operation. Therefore,work is made on technical improvement and optimization of the process of the system.The work made includes,among others,the improvement of the structure of the mixing tank and adjustment of the direction of the tank’s outlet,optimization of the parameters of the mixing pump and enlargement of the pump’s flow channel from 90 mm to 110 mm. Practice shows that through the technical renovation,a remarkable result has been achieved,and the troubles previously encountered,such as blocking of cyclone’s underflow orifice by large pieces of gangue materials,accumulation of gangue materials in mixing tank and deterioration of pump performance because of the limited size of its flow path,have been thoroughly eliminated. The experience gained may serve as a reference for the operation and control of the pressure-fed 3-product H. M. cyclone.