Results The power radio of δ+ θ/α+ β at Fp1, Fp2, F3, F4, C3, C4, P3, P4, O1, O2, F7, F8, T3, T4, T5, T6 in group AD[(1.18±0.27), (1.11±0.30), (1.05±0.36), (1.03±0.31), (1.00±0.33), (1.06±0.36), (0.99±0.38), (1.04±0.37), (0.97±0.37), (1.05±0.38), (0.99±0.33), (1.10±0.23), (0.91±0.28), (0.93±0.32), (1.00±0.40), (0.95±0.34)] were significantly higher than those in controls [(0.65±0.19), (0.63±0.09), (0.59±0.13), (0.55±0.11), (0.54±0.18), (0.49±0.12), (0.50±0.19), (0.47±0.13), (0.40±0.21), (0.40±0.14), (0.61±0.18), (0.59±0.14), (0.59±0.19), (0.54±0.16), (0.45±0.18), (0.50±0.18)] (P<0.05). The power of relative band theta at Fp1、Fp2、F3、F4、C3、C4、P3、P4、O1、O2、F7、F8、T3、T4、T5、T6 in group AD were significantly higher than those in controls (P<0.05). The power of relative band delta at Fp2, F4, C4, P3, P4, O1, O2, F7, F8, T5 in group AD were significantly higher than those in controls (P<0.05, P<0.01). The power of relative band alpha at Fp1, Fp2, F3, F4, C3, C4, P4, O1, O2, F7, F8, T3, T5, T6 in group AD were significantly lower than those in controls (P<0.05). The power of band theta at Fp1, Fp2, F8, T4, P4 in group AD were significantly higher than those in controls (P<0.05). The power of band alpha at Fp1, F3, O1, O2, F7 in group AD were significantly lower than those in controls (P<0.05). The power of band beta at P3, O1, O2, T5 in group AD were significantly lower than those in healthy people(P<0.05).