By　solving　electron　tunneling　problem　in　semiconductor　superlattice,　the　magnetic-electric　controllable　spin　transport　is　theoretically　investigated.　The　results　show　that,　with　magnetic　modulation　only,　the　spin　transmission　will　separate,　and　with　the　magnetic　filed　increasing,　the　conductance　polarization　is　enhanced　and　its　peaks　are　widened.　By　both　magnetic　and　single　interval　electric　barrier　modulation,　the　conductance　polarization　will　be　evidently　improved;　and　at　the　same　time,　there　are　two　distinct　transport　regions　for　different　electric　modulation,　in　which　the　down-spin　electron　obeys　different　change　rules　with　different　electric　filed.　However,　applying　electric　modulation　at　intervals　of　two　periods　on　the　magnetic　superlattic,　it　is　noticed　that　the　critical　behavior　of　electron　spin　transport　disappears,　and　the　resonant　peak　of　the　conductance　polarization　also　degenerates　in　the　high　energy　region.　These　results　show　that　the　symmetry　is　an　important　factor　for　spin　transport　in　the　semiconductor　superlattice.