Test　exploitation　equipment　and　technology　have　progressed　considerably　in　marine　natural　gas　hydrate　(NGH)　exploitation,　but　many　critical　technical　issues　still　need　to　be　resolved　before　commercial　production.　Previous　studies　have　proposed　a　non-drilling　exploitation　device-a　self-entry　exploitation　device　(SEED)-but　reaching　the　NGH　commercial　exploitation　threshold　in　its　initial　state　is　difficult.　Consequently,　we　verified　and　evaluated　some　production　enhancement　measures　to　improve　the　exploitation　system　of　the　SEED.　In　this　study,　based　on　the　geological　data　from　the　SHSC-4　site　in　the　Shenhu　sea　and　the　material　characteristics　of　the　SEED,　we　carried　out　four　production　enhancement　measures　by　numerical　simulation.　The　results　indicate　that:　(i)　open-hole　position　adjustment　can　expand　the　contact　areas　between　the　device　and　NGH　reservoirs;　(ii)　the　effect　of　inner　wall　heating　is　limited　but　sufficient　to　achieve　the　goal　of　preventing　clogging;　(iii)　it　is　necessary　to　select　a　reasonable　spacing　according　to　a　combination　of　expected　production　cycle　time　and　pressure　when　carrying　out　clustered　depressurization;　and　(vi)　when　performing　depressurization　combined　with　thermal　stimulation　exploitation,　factors　such　as　permeability　and　thermal　conductivity　play　a　decisive　factor　in　gas　production.