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Using first-principles calculations,we investigate the structural,electronic and hydrogenated properties of the hexagonal BC7 sheet.The computed energy bands and density of states indicate that the BC7 sheet is a metal,and its metallicity mainly originates from the non-bonding pz electrons of the diagonal carbon of the B atom.When these carbon atoms are fully passivated by H atoms,the BC7 sheet becomes a semiconductor with a band gap of 2.41 eV.Our studies demonstrate that changing both the proportion of the boron atoms in the boron carbon sheet and its hydrogenation can tune the electronic properties of boron carbon two-dimensional material.