Abstract: The effective distribution coefficient of solidification structures under shearing and stirring was investigated to understand the effects of solidification velocity and rotation speed on solidification structures.A mathematical model of solidification structure evolution to solidification velocity and rotation speed was set up.Simulation results show that the morphology of solidification structures is strongly dependent on solidification velocity and rotation speed.With decreasing solidification velocity or increasing rotation speed,the shape factor of solidification structures increases.The mathematical model shows a very good agreement with experimental results.