Abstract: Carbonization method was used to process Bameng Magnesite ore.The light-burned magnesia produced by calcination was hydrated，carbonized，leached and calcined.As a result，a highly pure active product having an MgO grade of higher than 99.41% and an MgO recovery of  61.34% was obtained.The best process conditions include：a calcination temperature of 800 ℃，light-burning time of 2.5 h，vibrating grinding time of 2.5 min，hydration time of 30 min，Mg（HCO₃)₂  liquid temperature of 150 ℃，CO₂ aeration volume of 8 L/min，aeration time of 3 min，solid/liquid ratio of 60∶1 and pH value of 7.0 for the secondary carbonation.

Key words: Magnesia, Carbonization method, Magnesia