Abstract: Characteristics of the traditional heat preservation lining and the novel condensing lining were analyzed,and application of the condensing lining was put forward to prolong the service life of lining in the melting electric arc furnace for titanium slag. Wall temperature gradient and heat flux were calculated in the melting electric arc furnace with condensing lining. Taking 25 500 k VA melting electric arc furnace as an example,the increased 2.4% of heat loss with condensation lining is acceptable,considering the much higher maintenance cost and furnace shutdown loss with heat preservation lining. This paper can provide a method of determining the minimum thickness of the slag shell in titanium slag melting electric arc furnace with condensing lining. When the thickness of condensing lining composed of magnesite is 600 mm,the minimum thickness of titanium slag shell is 109 mm.