The　recirculation　of　dehumidification　and　regeneration　solutions　has　shown　promising　moisture　removal　rates　and　energy-saving　effects　in　liquid　desiccant　dehumidification　systems.　The　different　combinations　of　dehumidification　solution　recirculation　ratio　and　regeneration　solution　recirculation　ratio　under　varying　operating　conditions　can　have　different　impacts　on　the　system.　Nevertheless,　the　system　performance　under　full　operating　conditions　has　not　been　comprehensively　studied.　To　address　this　research　gap,　this　study　proposes　a　liquid　desiccant　dehumidification　system　with　a　solution　recirculation　structure,　defines　a　new　evaluation　index　—　matching　rate,　and　conducts　a　parameterized　study　and　optimization　of　the　steady-state　performance　of　the　liquid　desiccant　dehumidification　system　with　a　solution　recirculation　structure　within　the　range　of　solution　recirculation　ratios　under　all　operating　conditions,　by　integrating　the　system　cooling　capacity　and　energy　effectiveness　ratio.　The　performance　of　the　system　is　studied　by　varying　seven　key　parameters:　dehumidification　solution　recirculation　ratio,　regeneration　solution　recirculation　ratio,　total　solution　mass　flow　rate,　dehumidification　solution　inlet　temperature,　regeneration　solution　inlet　temperature,　and　ambient　air　temperature-humidity　ratio.　The　results　show　that　under　design　conditions,　the　solution　recirculation　ratio　within　the　full　operating　range　can　process　air　to　a　range　of　17.8℃～18.5℃　and　12.5　g/kg～17.4　g/kg.　The　maximum　system　cooling　capacity,　energy　effectiveness　ratio　and　matching　rate　values　are　21.5　kW,　0.21　and　0.42　respectively.　The　recommended　(dehumidification　solution　recirculation　ratio,　regeneration　solution　recirculation　ratio)　schemes　for　high,　medium　and　low　demand　of　system　cooling　capacity　are　(0.7～0.9,　0～0.5),　(0.4～0.6,　0～0.7)　and　(0～0.3,　0.4～0.7)　respectively,　based　on　the　requirements　of　system　cooling　capacity.　©　2023　Elsevier　Ltd