With the extensive development and utilization of clean energy and affected by various factors，clean energy has been abandoned seriously，especially in the winter heating season in the north． Ｒestricted by the heating of co － generation units，the thermal units for heating supply occupy the space of clean energy accommodation． On the one hand，the electric heating method reduces the constraints of co － generation units and expands the space of clean energy accommodation，on the other hand，it is also environmentally friendly． However，there exists many factors of effectiveness evaluation in using electric heating which belongs to the secondary energy reuse． Aiming at the power supply mode of electric heating in urban power grid， the technical and economic comparison between electric heating and coal － fired ( gas) heating is carried out，several feasible modes of electric heating are analyzed，and some aspects that need to be paid attention to in using electric heating are put forward，which can provide a reference for the promotion of electric heating and the improvement of urban cleaning level