In　order　to　solve　the　problem　of　the　dramatic　increase　in　transport　energy　consumption,　it　is　necessary　to　study　the　hydraulic　characteristic　of　DHS(District　heating　system).　Through　the　survey　of　DHS　in　different　cities,　the　form　of　heating　network　was　founded　to　be　looped　pipeline　network　(LPN)　with　multiple　heat　sources.　The　deficiencies　of　the　past　hydraulic　model　used　for　the　dendritic　pipeline　network　(DPN)　are　discussed.　It　was　pointed　out　that　LPN　with　multiple　heat　sources　is　spatial　network.　Graph　theory　is　applied　to　the　establishment　of　spatial　network.　Furthermore,　a　hydraulic　model　of　LPN　with　multiple　heat　sources　is　established.　MKP　method　is　used　to　solve　the　mathematical　model.　And　an　actual　engineering　case　is　used　to　verify　the　accuracy　of　the　model　and　its　solution　method.　It　provides　a　theoretic　and　practical　basis　for　the　study　of　hydraulic　characteristic　of　LPN　for　DHS.