Abstract: Based on standard k-ε turbulence model and Mixture multiphase flow model, the internal flow field characteristics of KYF type flotation machine of 20 L for gas-liquid two phases are numerically simulated, and the effects of stirring on flow field characteristics are investigated.The results indicate that the flow field characteristics including the absolute velocity for two phases, static pressure, turbulence kinetic energy and viscosity eddy for liquid of Y=0 section distribute symmetrically along the shaft.And the velocity field distributes into two cycles up and down in the flotation machine.The stirring intensity has a remarkable influence on the velocity, pressure and gas volume fraction distributions in the mixing zone.The influence on the floating zone and the separation zone is relatively small.For each additional 50 rpm of stirring intensity, the velocities increase by about 0.03 m/s, 0.01 m/s and 0.001 m/s respectively ranging from the mixing zone to the separation zone.Meanwhile the negative static pressure in the rotational zone increases by about 400 Pa.However the gas volume fraction decreases by about 0.01%～0.3% in the mixing zone.The simulation study can provide reference for the cooperative control of the flow field characteristics and flotation technical indexes in the flotation machine.