Objective:To analyze and compare summating potential(SP)and action potential(AP)in electrocochleogram for diagnosing Meniere’s disease(MD). Methods:All 96 adults(123 ears)were divided into three groups:control group

MD diagnosed group

MD suspected group. Control group was consisted of 56 subjects with normal function of hearing(76 ears were tested);MD diagnosed group was consisted of 25 subjects(29 ears from 21 subjects with single ear and 4 subjects with double ears);MD suspected group was composed of 15 subjects(18 ears from 12 subjects with single ear and 3 subjects with double ears). The SP/AP amplitude ratio and SP/AP area ratio of MD suspected group and MD diagnosed group were compared. Results:The SP/AP amplitude ratio from 95%reference of control group ranged from 0.01 to 0.32

and the positive standard was higher than 0.32;the SP/AP area ratio from 95%reference was 0. 68-1. 82

and the positive standard was higher than 1.82. In MD diagnosed group

the positive rate of the SP/AP amplitude ratio was 14.29%(15 out of 105);the positive rate of SP/AP area ratio was 25.71%(27 out of 105);the positive ratio of SP/AP area ratio was higher than that of amplitude ratio(χ2=6.050

P=0.014). In MD suspected group

the positive rate of SP/AP amplitude ratio was 16.67%(3 out of 18)and the positive rate of SP/AP area ratio was 77.78%(14 out of 18). There were statistical differences between SP/AP area ratio and amplitude ratio(χ2=9.091

P=0.003);the positive ratio of SP/AP area ratio was higher than that of SP/AP amplitude ratio. Conclusion:SP/AP area ratio is superior to SP/AP amplitude ratio in diagnozing MD.