The　spiral-wound　heat　exchangers　are　widely　used　in　industrial　applications,　but　the　mechanism　of　flow　and　heat　transfer　in　shell　side　has　not　been　clarified　yet.　A　three-dimensional　model　is　developed　based　on　the　FLUENT　software　in　this　study,　with　emphasis　on　quantifying　the　effects　of　the　main　geometry　parameters,　such　as　the　tube　number　per　circle　in　the　first　layer,　the　tube　external　diameter,　the　central　cylinder　diameter　and　the　tube　pitch,　on　the　flow　and　heat　transfer　are　discussed　respectively.　It　is　found　that　as　the　tube　number　per　circle　in　the　first　layer　increases,　the　Nusselt　number　increases　and　the　pressure　loss　per　unit　length　increases　first　and　then　decreases　and　the　similar　trend　is　obtained　as　the　central　cylinder　diameter　increases.　The　Nusselt　number　and　pressure　loss　both　increase　with　the　increase　of　tube　external　diameter.　As　the　tube　pitch　increases,　the　Nusselt　number　and　the　pressure　loss　both　decreases.