The　urban　heat　island　(UHI)　effect　seriously　challenges　sustainable　urban　development　strategies　and　livability.　Numerous　studies　have　explored　the　UHI　problem　from　the　perspective　of　isolated　blue　and　green　patches,　ignoring　the　overall　function　of　cold　island　networks.　This　study　aims　to　explore　the　construction　method　of　cold　island　network　by　integrating　scattered　cold　island　resources,　rationally　guiding　urban　planning　and　construction,　and　providing　effective　ideas　and　methods　for　improving　the　urban　thermal　environment.　Taking　the　central　city　of　Fuzhou　as　an　example,　the　identification　of　the　cold　island　core　source　(CICS)　was　optimized　by　applying　relative　land　surface　temperature　(LST),　morphological　spatial　pattern　analysis,　and　landscape　connectivity　analysis.　The　combined　resistance　surface　was　constructed　based　on　a　spatial　principal　component　analysis.　Subsequently,　the　cold　island　network　was　constructed　by　applying　circuit　theory　and　identifying　the　key　nodes.　The　results　showed　that　the　central　and　eastern　parts　of　the　study　area　experienced　the　most　significant　UHI　effects　and　there　was　a　tendency　for　them　to　cluster.　Overall,　48　core　sources,　104　corridors,　89　cooling　nodes,　and　34　heating　nodes　were　identified.　The　average　LST　of　the　CICSs　was　28.43　degrees　C,　significantly　lower　than　the　average　LST　of　the　entire　study　area　(31.50　degrees　C),　and　the　104　cold　corridors　were　classified　into　three　categories　according　to　their　importance.　Different　targeting　measures　should　be　adopted　for　the　cooling　and　heating　nodes　to　maintain　the　stability　of　the　cold　island　network　and　prevent　the　formation　of　a　heat　network.　Finally,　we　suggest　a　model　for　urban　cold　island　network　construction　and　explore　methods　for　mitigating　issues　with　UHI　to　achieve　proactive　and　organized　adaptation　and　mitigation　of　thermal　environmental　risks　in　urban　areas,　as　well　as　to　encourage　sustainable　urban　development.