Abstract: For improving the efficiency of the design and manufacture of multipolar magnetic circular, finite element method (FEM) has been used for the field distribution simulation of multipolar magnetic circular. Supposing magnetic material's permeability is 1.2, coercive force is 11 000 Oe, the charts of magnetic-flux distribution and magnetic-field distribution were obtained by computer simulation for four-polars inner-closed circular and out-closed circular magnetisms made by rare-earth magnetic material and are compared with those by traditional formula simulation. FEM provids more detailed numerical and chart results for the research of multipolar magnetic circular and considering the affacfion and effect between the magnetisms.