Abstract: In order to study the construction of φ16 m stirring tank under construction by a mining company in Liaoning province, the multiphase flow field in the stirred tank was numerically simulated and analyzed by usingk-ε turbulence model and multiple reference coordinate system (MRF) in CFD software. The effects of different shapes and installation modes of the baffles on the stirring performance were studied. The results show that the forward baffle is more beneficial to the multiphase flow mixing than the straight baffle structure, and the ideal mixed zone (58%～62%) is the highest when the forward baffle is used. When the angle of inclination is 45°, the proportion of the ideal mixing zone reaches 88.48%, and the optimal stirring effect is achieved.