The　depressurization　method　and　its　modified　scheme　may　be　the　best　way　to　efficiently　recover　marine　natural　gas　hydrate　(NGH)　from　the　reservoir.　However,　the　capacity　of　existing　engineering　tests　still　poses　considerable　challenges　to　the　industrial　development　of　NGH.　The　complex　structure　wells　can　effectively　promote　the　NGH　contact　area　to　enhance　the　exploitation　efficiency,　but　the　influence　of　branch　parameters　on　gas　production　performance　is　not　well　sorted　out　for　reference　when　performing　well　type　optimization.　Therefore,　a　geological　model　of　an　ideal　hydrate　reservoir　and　65　wellbore　models　were　established　based　on　the　geological　data　from　station　AT1　in　Nankai　Trough　to　analyze　the　influence　of　different　branch　parameters　on　the　production　capacity　for　various　well　types.　Results　indicate　that　the　open　hole　section　length　is　heavily　constrained　by　the　size　of　the　reservoir　for　a　single　well.　Compared　to　the　corresponding　single　well,　the　multi-branch　vertical　wells　can　increase　productivity　by　about　2.12%–51.18%,　the　multi-branch　horizontal　wells　by　about　0.99%–29.75%,　and　the　cluster　horizontal　wells　by　about　54.36%–250.66%　well.　Moreover,　the　correlation　coefficients　of　various　branch　parameters　were　analyzed　as　a　reference　when　optimizing　the　well　type　and　show　that　the　cluster　horizontal　well　has　the　highest　sensitivity　to　branch　parameters,　which　can　significantly　promote　gas　production　efficiency,　and　is　expected　to　break　the　threshold　of　industrial　development.　©　2022　Elsevier　B.V.