A　reciprocating　magnetic　refrigerator　was　developed　based　on　the　active　magnetic　regeneration　technology.　Rare　earth　metal　Gd　and　intermetallic　compound　LaFe11.2Co0.7Si1.1　were　used　as　the　magnetic　operating　materials　in　the　machine.　The　particles　of　the　magnetic　operating　materials,　with　diameter　of　0.5　-　2　mm　and　total　mass　of　950　g,　were　mounted　in　the　cooling　bed.　A　magnetic　field　was　assembled　using　NdFeB　rare　earth　permanent　magnets.　It　had　the　magnetic　field　space　of　Phi　34　x　200　and　the　magnetic　induction　of　1.5　T.　The　water　at　pH　=　10　is　used　as　a　heat　transfer　fluid.　When　the　ambient　temperature　is　296　K,　a　temperature　span　of　18　K　was　achieved　after　operation　of　45　min　at　a　frequency　of　0.178　Hz.　The　temperature　span　and　the　output　power　increase　significantly　with　the　increasing　velocity　of　heat　transfer.