With　an　increasing　emphasis　on　energy　efficiency　and　reliability,　heating　network　with　multiple　Loops　and　multiple　sources　are　becoming　more　widely　considered　among　the　DHS　(District　heating　system).　Previously　reported　hydraulic　methods　of　heating　network　have　the　deficiencies　that　the　water-supply　network　and　return　network　is　symmetrical　and　the　flow　of　the　heating　users　and　the　heat　source　must　be　given,　or　the　valves　in　the　network　are　all　assumed　at　the　maximum　opening.　Therefore,　this　study　applies　MKP　modeling　techniques　to　identify　hydraulic　condition　of　a　complex　heating　network　with　three　heat　sources,　three　loops,　530　nodes,　631　pipe　sections　and　102　fundamental　circuits.　The　fundamental　circuit　matrix　of　the　spatial　network　and　the　graph　theory　also　applied　to　evaluate　and　interpret　the　mathematical　model　results.　The　calculative　process　of　the　method　is　provided.　The　flow　direction　of　water-supply　network　under　normal　condition　and　the　operation　conditions　of　three　circulation　pumps　are　identified.　It　may　represent　useful　tools　for　the　study　of　hydraulic　characteristic　of　complex　heating　network　with　multi-heat　sources　and　multi-loops.　©　(2012)　Trans　Tech　Publications.