The working principle of a high-temperature resistance heating muffle furnace is based on resistance heating. When electric current flows through the resistance wires or ceramic heating elements installed in the furnace, these elements resist the flow of electricity and convert electrical energy into heat. This heat is then transferred to the air and objects inside the furnace, raising their temperature. The furnace is typically equipped with advanced temperature control systems to ensure that the heating process is stable, and precise temperature settings can be maintained to achieve the desired results.