Abstract: Studying the energy storage characteristics of the heating network in a distributed energy heating system is necessary for formulating a control strategy for efficient energy utilization. In this paper, based on the study of the energy storage effect of distributed energy heat networks, a calculation model for energy storage of heat networks was established. This model describes an important parameter of heat storage energy storage characteristics: the duration of energy storage. The model was improved by introducing the influence factor θto make the temperature of the heat exchange section of the heating network more consistent with the actual situation. According to the test data of three heat exchange stations, the lag time of the proposed model was calculated to verify the correctness of the model. By calculating the actual case, the duration of energy supply in the heat network was obtained and analyzed, and it was concluded that there is an optimal flow rate for the circulating water pump. In addition, the time-division heating mode was analyzed and calculated, and the distribution of the heating network water supply temperature with time that was positively correlated with the outdoor temperature within 24 hours.