Sm-Fe　system　giant　magnetostrictive　films　were　prepared　by　ion　beam　sputtering.　The　bending　property　of　the　giant　magnetostrictive　film/glass　substrate　cantilever　was　studied　by　finite　element　modeling.　The　internal　magnetic　states　of　the　giant　magnetostrictive　films　were　simulated.　The　finite　element　analysis　results　show　that　the　deflection　is　in　direct　proportion　to　the　film　thickness　and　quadratic　parabola　to　the　substrate　thickness　when　the　film　thickness　is　much　less　than　the　substrate　thickness.　The　analysis　results　are　well　comparable　to　the　experiment　ones.　The　internal　magnetic　field　of　Sm-Fe　single　film　is　uniform.　Inside　the　Sm-Fe/Fe　composite　film,　because　of　the　negative　magnetic　effect　of　Fe　film,　the　internal　magnetic　field　of　Sm-Fe　film　becomes　nonuniform,　and　the　magnetic　induction　is　less　than　that　of　the　Sm-Fe　single　film.