Abstract: This paper respectively discussed the influences of vacuum level, distillation temperature, dis-tillation load and spray water system on vacuum distillation process of titanium sponge, according to the characteristics of titanium sponge production by half-combined I-type furnace.A higher vacuum level and better gas tightness of the alembic, a smaller distillation load and directly heating the furnace to 960~1 020℃ are favorable for increasing the evaporation rate and shortening the distillation period.In addition,by using the sudden decline of vacuum degree in the top of condenser tank as the judgment for vacuum distillation channel opening and adjusting the temperature of spray water periodically, the distillation effi-ciency decrease and distillation channel blocking of I-type furnace which are caused by the gas-liquid-solid phase transformation of Mg and MgCl₂ in condenser tank are efficiently resolved.