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A low MgO content in sinter is conducive to reduce the MgO content in blast furnace slag. This study investigated the effect of MgO content in sinter on the softening–melting behavior of the mixed burden based on fluxed pellets. When the MgO content increased from 1.31wt％ to 1.55wt％, the melting temperature of sinter increased to 1521℃. Such an increase was due to the formation of the high-melting-point slag phase. The reduction degradation index of sinter with 1.31wt％ MgO content was better than that of others. The initial softening tem-perature of the mixed burden increased from 1104 to 1126℃ as MgO content in sinter increased from 1.31wt％ to 1.55wt％, and the melting temperature decreased from 1494 to 1460℃. The permeability index (S-value) of mixed burden decreased to 594.46 kPa·℃ under a high MgO content with 1.55wt％, indicating that the permeability was improved. The slag phase composition of burden was mainly akermarite (Ca2MgSiO7) when the MgO content in sinter was 1.55wt％. The melting point of akermarite is 1450℃, which is lower than other phases.