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The concept of 'multi-stage deep thermal reduction' was proposed,the technology of magnesium/aluminum thermal self-propagating high-temperature synthesis( SHS) multi-stage deep reduction to prepare titanium and its alloys.The high purity reduced titanium powder with purity of 99. 69%,Ti-6Al-4V powder with oxygen content less than 0. 15% and TiAl alloy ingot of 20 kg scale( the atomic ratio of Ti/Al was 1∶1) with oxygen content 0. 09% were successfully prepared with this technology. The achievements have been successfully transformed and applied in Shandong Fushan Group. The 200 t/a reduced titanium powder industrial demonstration line was successfully put into operation on December,2019. This technology solves the problem that traditional metallothermic reduction can not completely reduce TiO_2 to directly prepare titanium and its alloys,which can reduce the production cost of titanium by about 30%,and lay an industrial foundation for low-cost clean preparation and application of titanium materials.