The melting of bottle and jar glass is mostly carried out inside flame furnace (see glass melting furnace) in a continuous operation. The daily output of the horizontal flame furnace is generally more than 200t, and the large one is 400-500t. The daily output of the horseshoe-shaped flame furnace is mostly below 200t. The glass melting temperature is as high as 1580～1600℃. The energy consumption of melting accounts for about 70% of the total energy consumption in production of glass bottles. Energy can be effectively saved by measures such as integrated heat preservation of the melting furnace, increasing the capacity of the regenerator checker bricks, improving the distribution of the stockpile, improving the combustion efficiency and controlling the convection of the glass liquid. Bubbling in the melting tank can improve the convection of glass liquid, strengthen the process of clarification and homogenization, and increase the output. Using electric heating in a flame furnace can increase output and improve quality without enlarging the kiln.