The invention relates to a method to deoxidize and purify titanium or titanium alloy. It adopts rare earth as element purifying agent to take deoxidizing and purification process to titanium or titanium alloy. The agent includes La 35-55wt%, Ce 25-35wt%, Nd 5-25wt%, Pr 8-10wt%, and Y 4-5wt%. The added quantity agent is 0.01-0.1% of the weight of titanium metal liquation. The titanium or titanium alloy is melted in vacuum middle frequency induction furnace lime crucible. When the temperature reaches to 1650-1720 degree centigrade, the agent would be added and quieting for 15-25 minutes and casting to gain the titanium or titanium alloy with low oxygen content. |