The optimized use of Mg O flux in the agglomeration of high-chromium vanadium–titanium magnetite was investigated systematically through sinter and pellet experiments. Mg O was added in the form of magnesite. When the content of Mg O in the sinter was increased from 1.95wt% to 2.63wt%, the low-temperature reduction degradation index increased from 80.57% to 82.71%. When the content of Mg O in the pellet was increased from 1.14wt% to 2.40wt%, the reduction swelling index decreased from 15.2% to 8.6%; however, the compressive strength of the oxidized pellet decreased dramatically and it was 1985 N with an Mg O content of 1.14wt%. This compressive strength does not satisfy the requirements for blast-furnace production. When all of the aforementioned results were taken into account, the sinter with a high Mg O content(2.63wt%) matching the pellet with a low Mg O content(less than 1.14wt%) was the rational burden structure for smelting high-chromium vanadium–titanium magnetite in blast furnaces. The optimized use of Mg O flux in the agglomeration of high-chromium vanadium-titanium magnetite was systematically through sinter and pellet experiments. MgO was added in the form of magnesite. When the content of MgO in the sinter was increased from 1.95 When the content of MgO in the pellet was increased from 1.14% by weight to 2.40% by weight, the reduction swelling index increased from 80.57% to 82.71% to compressible strength of the oxidized pellet decreased dramatically and it was 1985 N with an MgO content of 1.14 wt%. This compressive strength does not satisfy the requirements for blast-furnace production. When all of the results the sinter with a high MgO content (2.63 wt%) matching the pellet with a low MgO content (less than 1.14 wt%) was the rational burden structure for smelting high-chromium vanadium-titanium magnetite in blastfurnaces.