Effects of varied geometric parameters in the structure of magnetic fluid sealing on its magnetic leakage were studied.Models were built under different sealing gaps,different width of teeth,different width of grooves,different depth of grooves and different stage numbers.Magnetic leakage of these models was calculated numerically with finite element method.The results show that there is a critical value of distance in axial and radial directions of the sealing structure,and the change of magnetic leakage w...