The geometric, electronic, bonding, and orbital characteristics, as well as magnetic shielding effect and induced ring current of carborazine and borazine were theoretically studied and compared with those of benzene. The combination of multiple properties shown that carborazine, like benzene, is strongly aromatic, while borazine only exhibits rather weak aromaticity. The C atom between B and N atoms in carborazine behaves as an interconnecting bridge that strengthens the electron delocalization over the conjugated path, which is the essence of the distinctly different aromaticity between the isoelectronic analogues of benzene.