Auditory brainstem responses(ABRs) are thought to be the far-field refraction of electrical events originating in the auditory pathway through the brainstem. ABRs provide the basis of their usefulness as an objective method for assessing hearing especially in the pediatric population, and also used for neuro-otologic diagnosis, even in detection and localization of occult lesion in neurological disease. Stimulus characteristics can account for much of the intersubject and intrasubject variability of ABR latencies and morphology, and so knowledge of the these normal values and their variations, as a precondition for establishing criteria for abnormality is essential to the interpretation of ABR in clinical situation. The present study examined the effect of click rate, polarity, intensity of ABRs of 50 adult male, who had no history of ear disease. The results were as follows ; 1) When the stimulus click rate was increased, absolute latency of wave I, II, III and III-V interwave latencies are significantly increased. 2) When the stimulus click rate was increased, pattern B was increased but pattern C was decreased. 3) Absolute latencies were not correlated to the polarity change. 4) Frequency of occurrence of same IV-V complex wave pattern in these two ears was 56%. 5) When the stimulus click intensity was increased, V peak latency was decreased.