The results show that the Fermi-energy decreases with increasing the degree of disorder, and the off-diagonal disorder has great effect on the Fermi-energy.

• 结果表明：无序体系的费米能随无序度的增大而减小，并且非对角无序对体系费米能的影响很大，考虑非对角无序时，体系的费米能大大降低；