Over　600　million　square　meter　heating　area　use　the　district　heating　system　in　Beijing　up　to　2013.　The　construction　and　operation　level　of　many　heating　systems　are　diverse.　It　leads　to　the　difference　in　the　heating　energy　consumption　and　cost.　The　obstacles　that　impacts　on　the　energy　efficiency　improvement　for　the　district　heating　system　in　Beijing　were　presented.　The　primary　job　to　reduce　the　gross　heating　energy　consumption　is　to　evaluate　the　energy　efficiency　of　the　heating　system,　reasonably.　The　aim　of　the　paper　was　to　provide　an　improved　method　to　evaluate　the　energy　efficiency　of　a　district　heat　system.The　energy　conversion　between　the　different　typical　parts　of　a　heating　system　was　discussed:　the　source,　the　primary　network,　the　secondary　network,　the　heat　exchanger　station　and　the　building.　Also,　six　district　heating　system　in　Beijing　was　evaluated　by　the　method　to　illustrate　the　proposed　technique.　©　(2014)　Trans　Tech　Publications,　Switzerland.