Abstract: Because of complex Turbulent Flow in bag filter dust collector,becoming eddying back flow,it makes destruction in filter bag back.In order to explain it,CFD software is used to simulate the distribution of Turbulent Flow in Bag Filter in this paper.Putting boundary conditions such as inlet velocity,and using k-ε Turbulent Flow model to simulate gas phase current,the situation of all velocity filed and gas track is analyzed for improving and designing Bag Filter to provide theoretical base.