Enhanced　gas　collection　cover　(EGCC)　was　proposed　in　order　to　achieve　efficient　gas　collection　from　municipal　solid　waste　landfills　in　China　and　eliminate　environmental　pollution　and　personal　safety　issues　caused　by　the　disorderly　release　of　landfill　gas.　This　facility　from　top　to　bottom　includes　a　HDPE　geomembrane,　gas　collection　pipes　and　a　soil　regulating　layer.　The　Air/W　module　in　Geo-studio　software　was　used　to　analyze　the　gas　closure　performance　of　the　EGCC　and　relevant　influencing　factors.　Results　show　that　the　inherent　permeability　of　the　soil　regulating　layer,　the　extraction　pressure　within　the　gas　collection　pipes,　and　the　thickness　of　the　landfilled　waste　are　three　main　factors　that　affect　the　gas　closure　performance　of　the　EGCC.　The　maximum　pressure　under　the　HDPE　geomembrane　increases　with　the　decrease　in　the　inherent　permeability　of　the　soil　regulating　layer,　the　increase　in　the　extraction　pressure　within　the　gas　collection　pipes　and　the　increase　in　the　thickness　of　the　landfilled　waste.　A　formula　for　estimating　the　arrangement　spacing　of　the　gas　collection　pipes　based　on　the　soil　regulating　layer　and　the　extraction　pressure　within　the　gas　collection　pipes　was　proposed.　It　is　recommended　that　preference　should　be　given　to　locally　available　medium　sand　or　coarser　soils　as　soil　regulating　layers.　Xiaping　Landfill　in　Shenzhen　had　achieved　a　7-fold　increase　in　landfill　gas　collection　rate　from　2014　to　2019　after　adopting　the　EGCC　combined　with　multiple　gas　extraction　wells,　with　a　landfill　gas　collection　efficiency　increasing　from　less　than　30%　to　over　90%.　©　2024　Zhejiang　University.　All　rights　reserved.