Kinematics,　workspace,　dynamics　behavior　of　a　3-DOF　3-Legged　parallel　robot　with　horizontal　slide　3-link　for　steel　snagging,　which　was　developed　by　Northeastern　University,　are　introduced.　The　steel　spot　snagging　experiments　have　also　been　carried　out.　The　wheel　selection,　removal　rate,　grinding　power　and　their　influence　factors　are　studied.　Comparing　with　hanging　grinders　used　in　most　steel　mills　of　our　country,　this　robotic　grinder　can　reduce　labor　intensity　of　workers,　raise　efficiency　and　guarantee　quality　greatly.