Combination with corroded situation of electric melting furnace throat refractories, the width and length design of throat was adjusted based on the quality, critical output and thermal conductivity of refractory. The flow rate of the throat is greater than the critical flow rate in glass electric melting furnace during one furnace service life, and the quality of the glass liquid will not be affected by backflow. According to the importance of different temperature and location of the surface layer of the cover brick in the throat, different quantities of cooling air are transported to cool the cover brick, so as to slow down the erosion speed of the cover brick. At the same time, when the cover plate brick is eroded to a certain extent, the second brick should be added to form a new cover plate of the throat, so that to prolong the service life of the throat and the electric glass furnace.