Amount　of　the　coal　mine　ventilation　air　methane(VAM)　is　unable　to　be　made　effective　use　and　discharges　into　the　atmosphere　for　the　low　concentration　of　methane.　It　not　only　pollutes　the　environment　but　also　results　in　a　waste　of　energy　resource.　In　this　paper,　the　VAM　was　enriched　experimentally.　The　first　pilot　VAM　enrichment　equipment　with　the　gas　processing　capacity　of　500　m3/h　was　built.　The　plant　included　two-stage　VPSA　separation　system　with　three　parallel　connected　adsorbers　respectively,　where　we　introduced　a　new　process　with　the　effluent　gas　pressurization　step　and　vacuum　exhaust　step.　By　employing　a　modified　coconut　active　carbon,　the　VAM　concentration　can　raise　from　0.2%　to　more　than　1.2%.　The　result　shows　the　vacuum　emission　process　could　enrich　the　concentration　of　the　product　significantly,　when　the　vacuum　exhaust　ratio　increase　from　0　to　0.224,　the　methane　concentration　of　the　product　increases　1.89　times.　The　adsorption　heat　has　little　influence　on　the　temperature　of　the　adsorber,　and　the　temperature　variation　during　the　VPSA　cycle　is　no　more　than　3　°C.