Abstract: Hordeum jubatum  was potcultured with the soil sprayed with different amounts of magnesite dust (0, 1%, 5%, 10%, 15%, 20%, and 30%) to study the magnesium (Mg) tolerance of the plant. After sprayed onto soil surface, the magnesite dust could rapidly form a crust. When the amount of the sprayed dust was bigger than 20%, soil pH increased significantly, soil conductivity had a gradual decrease, whereas soil organic matter content increased after an initial decrease. With the increasing amount of sprayed magnesite dust, the leaf chlorophyll content of H. jubatum increased first and decreased then, while the leaf soluble protein content showed a trend of increase  decrease  increase. H. jubatum had stronger tolerance to Mg. When the soil Mg content was as high as 4.61 g·kg^-1, H. jubatum could still grow  well, indicating that this plant species could be used as an appropriate candidate for the ecological restoration of waste lands in magnesite mining areas.