Building energy consumption (BEC) accounts for a large proportion in the whole energy consumption, and heating energy consumption (HEC) in the proportion of BEC is the largest in heating areas in northern China. How to take effective measures to reduce heating energy consumption has become an urgent problem needs to be solved in the building energy conservation work. Existing buildings and heating system in heating areas in northern China was studied, which helped to give the heating model on the heating energy consumption. Based on the heating model, related factors influencing the heating energy consumption were studied. And effective measures used to reduce HEC were proposed, which provided a reference and basis for the optimal design and operation of building envelope and heating system in heating areas in northern China.