Aiming at the levee engineering on the midd le and lower reaches of Yangtze River,some typical conditions are gene ralized.The seepage fields in levee and its foundation under different condition s ar e simulated with FEM.The influences on seepage field by various factors,such as water head,levee permeability,less peamable covering strata thickness,the thic knesses of strong peamable layers laid under overburden and exposed to the groun d surface ,the wideness of foreland and the depth of river bed cut by water flow etc.,are analysed respectively.General regularities are summarized. 