Methods of objective tinnitus testing exploration causes of tinnitus and the relationship between OAE and tinnitus are reported. In 306 ears with tinnitus (with or without hearing loss), Distortion Products Otoacoustic Emission (DPOAE), Spontaneous OAE (SOAE) and Transiently Evoked OAE (TEOAE) were tested by ILO92 Otodynamics Analyzer. Results indicated that 1. In these cases there was no correlation between the frequency of tinnitus and SOAE. 2. In 94.8% of sensorineural hearing loss with tinnitus the DPOAE-gram presented lower amplitude or was absent within the frequency range of elevated pure-tone-thresthold; In 59% of cases with normal hearing and tinnitus the amplitude of DPOAE at nearby frequencies of tinnitus was decreased and there was no SOAE detectable. At frequencies other than that of tinnitus, the amplitude of DPOAE was normal and SOAE could be recorded. So OAE could reflect cochlear lesion in early stage.