The　relationship　between　magneto-vibration　and　magnetic　treatment　induced　tensile　residual　stress　reduction　in　the　steel　45　was　studied.　The　experimental.　results　show　that　the　residual　stress　can　affect　on　the　magnetostriction　behavior,　and　further　on　the　magneto-vibration　behavior.　When　residual　stress　existed,　the　value　and　the　range　of　the　magneto-vibration　are　different　from　those　without　residual　stress,　but　move　to　those　without　residual　stress　gradually　with　the　development　of　magneto-vibration.　On　the　other　hand,　the　residual　stress　in　steel　specimen　can　be　reduced　after　magneto-vibration.　Therefore　it　can　be　concluded　that　for　steel　materials　the　magneto-vibration　and　residual　stress　influence　each　other,　and　existed　a　non-linear　relationship　between　the　magnetovibration　and　residual　stress.