By the technique of decoupling with two-field iteration

a numerical analysis model is set up for solving the coupled problem of stress-seepage interaction by element-free method. The distribution laws of displacement

stress and seepage piezometric head of dam body and its foundation are analyzed in detail under the normal water level with and without when considering the stress-seepage interaction. It is shown that the displacement of dam under coupled condition is smaller than that of the not one

but their distributions are same. Meanwhile

the distributions of horizontal normal stress are different

and the vertical normal stress and shear stress and seepage equipotential lines are obviously different though their distributions are same too. The seepage flow can result in disadvantageous effect on stress of dam body under coupling condition. The calculation results accord with the general law.