Abstract: With the continuous growth of clean energy, such as photovoltaic power, wind power, etc., the electricity-heating hybrid system will be the development trend of the integrated energy system in the future. Firstly, an equivalent relationship between the electric power of the power system and the fluid mass flow rate of the heating network system is built to ensure that the electric power flow and heating power flow can be analyzed on the same time-domain scale. On this basis, the average temperature response model of the heating network system and the external characteristic model of the electric boiler are respectively constructed, thereby confirming the response status of the heating network system and the interactional variables between the electric and heating power flows. Based on the fundamental principles of the Newton method and hydraulic calculation of the heating network system, the power flow correction equations of the electricity and heating network system are deduced as well as its Jacobian matrix, thus developing a static power flow analysis method for the electricity-heating hybrid system considering the variation of the electric heating efficiency with the system operation environment. Finally, the case analysis is given to demonstrate the feasibility and practicability of the proposed method.